Our Free e-booklet explains it all in simple terms!
For 55 years and counting, Piper’s ubiquitous Cherokee has been a favorite of pilots worldwide. Safe, stable, and economical to own and fly, for many of us it is a “near perfect” personal airplane.
As happy as almost all owners are with their Cherokees though, many of them will admit to being a little less thrilled with the aircraft’s somewhat anemic performance during the critical take-off and climb-out regimes.
That is precisely where we can help:
Bolt-on a Power Flow Tuned Exhaust System and give your Cherokee that shot of extra “oomph” that you know it needs. See it, Hear it, Feel it, Try it - we give you a full 60 Day Money Back Guarantee. This boost of power will have you flying higher, faster, and on less fuel in no time, with only one side effect: a chronic & infectious ear-to-ear grin. The Power Flow Tuned Exhaust System is not just another replacement muffler - it is a vast improvement over the stock Piper exhaust system. Our system is currently installed and flying on more than 750 Cherokees worldwide making it one of the most thoroughly tested and widely accepted performance upgrades for Piper’s classic design.
The concept is simple, out with the old exhaust gases, in with the new fuel-air charge. By more effectively emptying each cylinder of spent exhaust gases, Power Flow gives your Cherokee a number of significant benefits:
1.) You will immediately notice an increase in RPM (30 - 130 more).
2.) On take-off, your Cherokee will break ground after a ground roll that is 100’ – 300’ shorter, and
3.) See a significant improvement in rate of climb (100 - 300 fpm). You are in control: Want to save fuel?
4.) You can use less throttle to fly at your current cruise speeds and save up to 2.2 GPH.
5.) For more power, use the extra RPM (100 RPM yields approximately five extra knots of airspeed for a slightly (about ½ GPH) higher fuel burn.
6.) CHT’s and oil temps are both significantly reduced (by 15O - 20O) and –
7.) The service ceiling is increased by 2,000 – 5,000 feet, with a corresponding improvement in performance during high density altitude operations.
Don't just take our word for it - listen to what just some of our happy Power Flow customers have to say about the Power Flow tuned exhaust system on their aircraft:
The Power Flow is a versatile, quality constructed, complete replacement of the entire exhaust system for your PA28. A new Cabin and Carburetor Heat shroud (utilizing your current SCAT tube hook-ups) is included. The entire system is constructed from 321 stainless steel and includes minimal structural welds in the cabin heat section for improved safety.
All necessary parts are included for easy installation, usually requiring just 5 - 7 hours. The system can be installed by one of our Authorized Dealers, by your local A&P, or you can fly to us for the installation. Fly in with a standard Piper Cherokee, fly out (usually the same day) tuned for maximum performance and efficiency.
Every Power Flow Tuned Exhaust System comes with an unconditional 60 day (from time of installation) money back guarantee. If you are not totally satisfied, for any reason, you can return the system for a full refund of your purchase price. Fine Print? You just read it.
Price for complete kit: $4,450.00 with Polished Tailpipe or $4,650.00 with Ceramic Coated Tailpipe
The Ceramic Coated tailpipe is a cosmetic enhancement that hides the heat induced discoloration that is characteristic of stainless steel (think of the "bluing" you see on the muffler of a motorcycle).
This discoloration has absolutely no effect on performance or reliability but the ceramic coating covers it up permanently. Otherwise, the polished tailpipe begins to discolor after a few hours of flying time.
It can be re-polished anytime, but if you are proud of your Cherokee's appearance and would rather spend your time flying than polishing, the ceramic is a nice feature to have.
Challenger Air Filter:
The Challenger air filter replaces the disposable foam filter media found on most aircraft with K&N's high efficiency reusable filter media which provides up to three times more air flow to the intake manifold of the engine. Our own testing has repeatedly confirmed Challenger's published data:
A boost in manifold pressure (up to ½”)
An increase of 1 - 2 knots in airspeed
An increase in available power on takeoff.
As mentioned above, the filter media itself is reusable. You just clean it and recharge it (coat it with oil so the dust sticks to it) once a year during annual and you can reuse it up to 25 times or 2,500 flight hours. Since the Challenger system significantly improves the intake side of your Cherokee’s engine at a very reasonable cost, we consider it to be the perfect complement to our Tuned Exhaust System which significantly improves the exhaust side.
A couple of other important pieces of information:
#1.) We strongly recommend that the aircraft's propeller be dynamically balanced to within 0.2 ips (inches per second) upon installation of the Power Flow System and every two to four years thereafter. If the propeller is dynamically balanced within 25 flight hours of the installation of the Power Flow System and you furnish PFS with copies of the logbook entries confirming this, PFS will extend the warranty on the Tuned Exhaust System from 12 months to 24 months or 500 Flight Hours (whichever occurs first).
Doing so every 2 - 4 years thereafter will dramatically improve the useful life and the reliability of every component that is bolted to the engine, including the Power Flow System.
#2) The Power Flow System has no service life limit. It is designed and built to last several thousand flight hours and will quite likely be the last exhaust system you need to buy for your aircraft. As with any high performance system however, it must be maintained properly. Every 500 flight hours or annually (whichever comes first) the four slip joints on the system must be cleaned and lubricated with high temperature anti-seize compound.
Most Customers have this maintenance performed during the aircraft's annual inspection which adds about 2 hours of labor to the inspection. We have had several of our Tuned Exhaust Systems rack up over 4,000 flight hours of trouble free performance (7,000+ flight hours is the current record in a commercial operation) as long as this maintenance is performed as required.
Still not sure if a Power Flow is right for you and your airplane? For complete peace of mind, check out our:
Click the RFG graphic above for more details.
*For more technical information please see "Tuned Exhaust Explained" on our home page.
Magazine Reviews on the Power Flow PA-28 Tuned Exhaust System:
“Power Flow’s tuned exhaust for the 140 packs that extra power.” AOPA Pilot, February 2002. (click to read)
“Overall, the Power Flow tuned exhaust delivers what the company promises. Though each installation is different, Power Flow is proving that its numbers are honest.” AOPA Pilot, February 2002. (click to read)
“A little boost in climb and cruise goes a long way.” Plane & Pilot, June 2004 (click to read)
“…the 140 also posted measurable improvement with the new exhaust system.” AOPA Pilot, February 2002. (click to read)
Posted 11/18/16: Owner Testimonial from 2016 Oshkosh Fly-In:
Posted 5/16/16: Owner Testimonial from 2016 Sun N Fun Flyin, Lakeland, FL:
Posted 3/30/16: Owner Testimonial from 2016 Northwest Air Conference in Puyallup, WA:
Posted 12/05/15: We ask Power Flow Customers 3 questions:
Customer Reviews on the Power Flow PA-28 Tuned Exhaust System:
"Well everyone, I finally did it. Flew down to Sun n Fun from Detroit in my 140 and stopped by in Daytona to get the Powerflow system installed on the way home. WORTH EVERY PENNY. MUCH better climb (added more than 300' minute easily). Higher speed by a few knots. Added 100+ RPM on the tach. Much shorter takeoff roll. Lower fuel consumption by > 1 gallon per hour. 140 performed flawlessly and the PowerFlow made the ride home a pleasure. Thanks Robin!" Jeffrey Dalton - Waterford, MI PA28-140 (O-320)
"I've had the Power Flow on my plane for about 3 months (approx. 50 hours) now, and I'm happy to say it is all that it's advertised to be and more. I've been very impressed with the takeoff and climb performance, even with my high-time engine. I'm seeing about 125 static rpm increase. On a 75 (F) degree day, fuel to the tabs (36 gal), I get a 1000ft/min climb-out at 85 MPH from our airport (1012 ft msl), where I used to get 600-700ft/min . Takeoff roll is noticeably shorter. My engine runs cooler, and the fuel burn is down about 0.8 - 0.9 gph. Thanks for a great product." Joseph Buckley - Mora, MN PA28-140 (O-320)
"It's official! After the first 5.5 hours of dual in our 68' Cherokee 140 I am a believer. The PowerFlow exhaust is amazing. My instructor flies his own 64' Cherokee 140/160 conversion and the first words out of his mouth were "WOW this thing climbs!" The 750fpm on a 75F degree day at 2600' density altitude was a shock. We have been flying at 1950 to 2000 pounds with full fuel and my lard butt plus the CFI. The engine is at 1900 hours since new so this is no small feat. The other comment from the CFI is how much quieter the cabin is and how cool the cockpit stays with the muffler removed from the firewall." Andy Jones - Dublin, OH PA28-140 (O-320)
"The Power Flow added an additional 125+ RPM on T/O, which translates into significantly more power.It accelerates faster (eagerly) and climbs out at 150 FPM better than before and cruises about 15 MPH faster. The CHTs dropped a whopping 50 to 100 degrees. The gain in speed may be subjective, but this bird gained at least 15 MPH. Since this installation, I've had zero oil on the belly. I don't have an air/oil seperator - now I don't need one. I'm a skeptic, but the Power Flow system watered my eyes with performance. A great mod!" Samuel Wilcox - APO, Panama PA28-140 (O-320)
"Before I was getting 200-400 FPM at 5,000 foot airport elevation, after was getting 400-600 FPM." Robert D. Stager - Kanab, UT PA28-160 (0-320)
"I stopped off in Daytona to have Vic at Power Flow do a flawless installation of the latest tuned-exhaust system for the 140... Wow! The improvement in performance is nothing short of amazing. Climb rate increased close to 300 fpm, top speed increased five knots and fuel consumption went down at least one gph. The real result for my business? Rentals of my aircraft have more than doubled since May, and my customers couldn't be happier. It was well worth the $4k investments in modification to improve the performance of 56041." Text published in PIPER FLYER, October 2004 Issue." Jeff Dalton - MI PA28-140 (O-320 160 HP)
"Climb out much better with the Power Flow exhaust." John Rough - Wayland, MI PA28-140 (O-320)
General Magazine Reviews on the Power Flow
“I’m not a test pilot but… even I could tell there was a difference. It was that obvious.” Flying Magazine, August 1999 (click to read)
"Although it’s not free, Power Flow has created the closest thing to free horsepower that we’ve seen.” AOPA Pilot, January 2000 (click to read)
“A rate-of-climb increase of about 20 percent is remarkable – not to mention the safety factor increase when leaving high-altitude airports or climbing through cloud layers.” Private Pilot Magazine, December 2000 (click to read)
“…boosts the Lycoming O-320’s output by at least 20HP, while simultaneously reducing fuel flow and lowering CHT’s. Geez, what a deal.” The Aviation Consumer, May 1999
“At the conclusion of the flights, there was no questions that the PFS had improved both climb and cruise performance.” Plane & Pilot, December 2006. (M20 200hp)
“Upon opening the large boxes, I was immediately impressed.” Cessna Owner Magazine, September 2002.
* Exhaust Kits have a normal lead time of 6-12 weeks, dependent upon our Sales offer. If you need an exhaust immediately, please call or indicate AOG in the “Notes” section of the online order. All other in stock items normally ship within 2 business days of order receipt. Your credit card will not be charged until the order and shipping cost are verified by our Sales Department and confirmed with you.
** Prices are for US and Canadian registered aircraft only. International customers may place an order online and will be contacted by Power Flow Systems, Inc. or a local authorized reseller regarding final pricing.
Power Flow Systems has a 100% customer satisfaction guarantee. If within 60 days from the date of the first flight after installation the customer is dissatisfied for any reason, they can return the system to Power Flow Systems and they will be entitled to a full refund of the purchase price of the system (exclusive of shipping charges and labor) once the system has been received and inspected by Power Flow Systems. Inspection will take place within five (5) days from the return of the system, and an adjustment to the refund amount will be made for any parts missing or damaged. If the original payment was made on a credit card, it will be refunded to the same credit card, if by check, company check will be issued.
The warranties provided by Power Flow Systems, Inc. in this Statement of Limited Warranty apply only to Exhaust Systems you purchase for your use, and not for resale, and not from Exhaust Systems that are acquired through transfer of ownership. Installation and use of the Exhaust System constitutes your agreement with the terms of this warranty. The term “Exhaust System” means a Power Flow Systems, Inc. exhaust system, its upgrades, elements or combination of them. Nothing in this Statement of Limited Warranty affects any statutory rights of consumers that cannot be waived or limited by contract. If you have any questions, please contact Power Flow Systems, Inc.
The Power Flow Systems, Inc. Warranty for Exhaust Systems
Power Flow Systems, Inc. warrants under normal use and service that each exhaust system is 1) free from defects in materials and workmanship and 2) conforms to FAA regulations where applicable. The warranty period for an Exhaust System is a specified, fixed period commencing on the Date of Installation. The date on your log book entry is the Date of Installation unless Power Flow Systems, Inc. or the Reseller informs you otherwise.
If an Exhaust System does not function as warranted during the warranty period, and Power Flow Systems, Inc. or your Reseller are unable to either 1) make it do so or 2) replace it with one that is functionally equivalent, you may return it to your place of purchase and your money will be refunded.
Extent of Warranty
The warranty does not cover the repair or exchange of a Power Flow Systems, Inc. exhaust system resulting from misuse, accident, modification, installation errors, unsuitable physical or operating environment, improper maintenance by you, installation not performed in accordance with our current and approved installation instructions or failure caused by a product for which Power Flow Systems, Inc. is not responsible. Power Flow Systems, Inc. reserves the right to deny any warranty claim.
THIS LIMITED WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES OR CONDITIONS, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THESE WARRANTIES GIVE YOU SPECIFIC LEGAL RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM JURISDICTION TO JURISDICTION. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF EXPRESS OR IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION OR LIMITATION MAY NOT APPLY TO YOU. IN THAT EVENT, SUCH WARRANTIES ARE LIMITED IN DURATION TO THE WARRANTY PERIOD. NO WARRANTIES APPLY AFTER THAT PERIOD.
Items Not Covered by Warranty
Power Flow Systems, Inc. does not warrant Exhaust Systems where end-users attempt to extract a Power Flow exhaust system from a third-party consumer. End-users, who chose to do this, do so at their own risk.
Power Flow Systems, Inc. Exhaust Systems may or may not fit once removed from the aircraft for which it was originally intended.
Power Flow Systems, Inc. does not warrant any outside labor costs associated with the installation, removal, inspection, repair or other considerations of the Exhaust System.
Any technical or other support provided for a Power Flow Systems, Inc. Exhaust System under warranty, such as assistance via telephone with “how-to” questions and those regarding Exhaust System set-up and installation, will be provided without warranties of any kind. Ultimately, it is the responsibility of the installer, A&P with inspection authority or equivalent, to determine the airworthiness of the installation in accordance with FAA regulations.
If during the warranty period, the Power Flow Systems, Inc. Exhaust System is not in good working order, Power Flow Systems, Inc. will, at its sole discretion, repair or replace it at no additional charge, provided that:
the vibration level of the engine and propeller does not exceed 0.2 IPS at a minimum of 2,000RPM (confirmed by a dynamic balance).
the Power Flow Systems, Inc. Exhaust System is installed on an airworthy engine.
the exhaust is in compliance with our Instructions for Continued Airworthiness Instructions (ICAW).
the Power Flow Systems, Inc. Exhaust System is installed on the designated aircraft it was purchased for.
During the warranty period, if warranty service is required, you may be required to acquire a dynamic balance for further investigation.
To obtain warranty service for an Exhaust System, contact Power Flow Systems, Inc. directly within thirty (30) days of defect discovery. Failure to do so and/or using a third-party for repairs or service will void the warranty. You may be required to present proof of purchase and log book entries. You are also responsible for returning the defective Exhaust System or Exhaust System component to Power Flow Systems, Inc. at your cost. Power Flow Systems, Inc. will not reimburse these shipping costs or any outside labor costs that may be associated with the installation, removal, inspection or repair of the Exhaust System.
Power Flow Systems, Inc. will pay for the outbound shipping expense (UPS ground or other non- expedited freight service) from our facility to the customer, but will not pay for shipments inbound to our facility for warranty repair.
1 Year or 500 Tach Hours whichever comes first.
Power Flow Systems, Inc. parts, Power Flow Systems, Inc. labor and shipping replacement to customer only.
Limitation of Liability
NEITHER Power Flow Systems, Inc. NOR ITS SUPPLIERS SHALL BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING OUT OF OR CONNECTION WITH THE SALE OR USE OF THIS PRODUCT, WHETHER BASED IN CONTRACT, TORT (INCLUDING NEGLIGENCE) OR ANY OTHER THEORY, EVEN IF Power Flow Systems, Inc. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Power Flow Systems, Inc. ENTIRE LIABILITY SHALL BE LIMITED TO REPLACEMENT, REPAIR, OR REFUND OF THE PURCHASE PRICE PAID, AT Power Flow Systems, Inc.’s OPTION.