Our Free e-booklet explains it all in simple terms!
Bolt-on a Power Flow Tuned Exhaust System and give your Skyhawk 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 a replacement - it is a vast improvement over the stock Cessna 172 exhaust system.
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 Skyhawk a number of significant benefits:
You will immediately notice an increase in RPM (30-130 more).
Significant improvement in rate of climb (100 - 300 fpm).
You are in control: Want to save fuel? You can use less throttle to fly at your current cruise speeds and save from 1/2 to 2.2 gallons per hour.
For more power, use the extra RPM (100 RPM yields approximately five extra knots of airspeed for an additional 1/2 gph in fuel burned).
The Service Ceiling on your 172 will increase by 2,000’ to 5,000’, with a corresponding improvement in safety margins in high Density Altitude environments.
CHT’s are reduced by 10O F – 20O F with less difference between cylinders.
Don't just take our word for it - listen to what just some of our happy C172 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 on your 172. 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 3 – 5 hours. The system can be installed by one of our Authorized Dealers, by your local A&P / IA, or you can fly to us for the installation. Fly in with a standard Cessna 172 Skyhawk, fly out (usually the same day) tuned for maximum performance and efficiency.
Our industry leading 60 day money back guarantee means that if for some reason the performance benefits listed above fail to materialize on your 172, you can return the system to us within 60 days of its installation for a full refund of your purchase price. Fine Print? You just read it.
Price for O-360 powered 172's (Choose either "Classic" or Short Stack Configuration): $4,650.00 with Polished Tailpipe or $4,850.00 with Ceramic Coated Tailpipe Discounts For:
“Classic” or Short Stack? The Classic is our original design from 1999. It is the “ideal” tuned length for this engine. Everybody loves the performance, only a mother (or an engineer) could love the looks. So, we came up with a compromise: The Short Stack is virtually indistinguishable from the stock Cessna exhaust and will give you about 85% - 90% of the performance gain of the Classic in a much more attractive installation.
If you operate on floats, frequently fly in high density altitude environments, or simply want the best possible “Bang for the Buck” we still recommend the Classic. Otherwise, you will be well-pleased with the performance boost you get from the Short Stack.
Polished or Ceramic?
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 172’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 flight testing has repeatedly confirmed Challenger's published data:
#1.) A definite boost in manifold pressure (up to ½ inch);
#2.) An increase of 1 - 2 knots in airspeed;
#3.) 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 the 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.
Part cosmetic (streamlines the appearance) and part performance, this option slightly reduces the drag of the tailpipe, but more importantly it creates a venturi to improve the air flow through the cowling for better engine cooling and lower CHT’s. The kit comes complete with STC and simple Installation Instructions.
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.
125 to 300 feet per minute (fpm) increase in climb rate
1.2 to 2.2 gallon per hour (gph) reduction in fuel burn
Cylinder Head Temperature (CHT) extremes reduced between cylinders and overall temperatures reduced
Exhaust Gas Temperature (EGT) extremes reduced between cylinders
Smoother running engine
Fully FAA STC'd tuned exhaust system manufactured under an FAA/PMA
Kit includes a complete 321 Stainless Steel Exhaust System, i.e... 4 headers, cabin heat shroud, carburetor heat, extractor system, muffler, support rod, STC, instructions, including all necessary hardware for installation (nuts, No-blo gaskets, etc.)
New & Improved design for Cabin heat and Carb heat exchangers; significantly more durable than the stock exchangers.
No welds in cabin heat area practically eliminating the possibility of Carbon Monoxide poisoning
Generally within 2 decibels of the original exhaust
Easy installation in only 4-6 hours for classic systems (3-5 hours for short stacks)
No modification to cowlling required on short stack systems; Classic kits require a minor cowling modification (a 1.5 inch hole must be drilled for support rod on 1972 or later model 172s. Template provided with kit)
60 Day Money Back Guarantee from day of installation
1 year or 500 tach hour (whichever comes first) warranty
Magazine Reviews on the Power Flow C-172 Tuned Exhaust System:
"Although it's not free, Power Flow has created the closest thing to free horsepower that we've seen." “…the airplane could reach redline rpm in cruise, something this Skyhawk was unable to do before.” AOPA Pilot, January 2000 (click here 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 here to read)
“This is a quantum leap in climb performance.” Cessna Pilots Association Magazine, August 1999
“I’m not a test pilot but… even I could tell there was a difference. It was that obvious.” “…the difference was obvious by comparing our height as we flew over the windsock during the two takeoffs.”Flying Magazine, August 1999 (click here to read)
“In the aircraft industry, you see many “mods” claiming incredible changes to performance. It is refreshing to see one that actually lives up to its performance claims.” Cessna Owner Magazine, September 2002. (click here to read)
“The engine gets a more complete fuel burn. The effect in the cockpit is that it will take less throttle to get the same RPM” Aircraft Maintenance Technology Magazine, March 2005 (click here to read)
Posted 03/30/16: Cessna 172 Customer Testimonial from 2016 Northwest Aviation Convention in Puyallup, WA:
Posted 12/04/15: Cessna 172 Customer Feedback:
Customer Reviews on the Power Flow C-172 Tuned Exhaust System:
Overall appearance was very good and installation done in approximately 1.5 hours (company claims 3 to 5 hours).. Paul Roberts - Stuart, FL C-172P (O-360 AirPlains conversion)
They're not getting my exhaust system back!! A friend of mine installed a PFS system on his 150hp C-172 a week before he assisted installing mine, and wasn't sure he likes the system. My 180hp C-172M lifts off in 75' to 100' less runway, climbs 2-300fpm faster, cruises 4-5mph faster, and now will redline rpm below about 5000' in level cruise. I'm not convinced it's quieter, though it maybe, but the aircraft is considerably smoother now. I used to get a real "buzz" when I leaned my head so that the head phones touched the window. Now it's more like a "hum." Early indications are that fuel consumption has decreased from 9-9.2gph to 7.6. I haven't flown it enough to confirm the 7.6gph, but that's what I got on the first tank after installation. Jim Hordyk - Fort Bragg, CA C-172M (O-360) Airplaines conversion
Shorter take-off, improved rate of climb, cylinder head temperatures lower, exhaust gas temperatures lower, MORE HORSEPOWER. AWESOME!! Roger D. Hrdlicka - Edgewood, WA C-172M (O-320)
Very satisfied so far. I guess I was expecting a little more increase, but still notice a definite increase in take off performance. Initial RPM increase on take off about 50. Able to back off power sooner, much better climb performance. James Schoenmann - Jackman, ME C172N (O-360 conversion)
* 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.