Bolt-on Horsepower     /    Complete Tuned Exhaust System:

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: 

• 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 10 F – 20 F with less difference between cylinders. 

• Exhaust Gas Temperature (EGT) extremes reduced between cylinders

• No welds in cabin heat area practically eliminating the possibility of Carbon Monoxide poisoning

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. 

For Lead Times and Discounts see the table below

*   Exhaust Kits have a variable lead time, dependent upon our Sales offer and manufacturing capacity - Please refer to the chart below for current lead times and any available discounts.  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. 

Click Here to order your new Power Flow exhaust directly through our online store!

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: 

Power Flow Systems Warranty Details

“Classic” Tailpipe or Short Stack Tailpipe? 

The Power Flow system is available in two basic configurations for your Skyhawk: The original “Classic” (Long Tailpipe) version and the newer “Short Stack”.  The Classic version does give the biggest performance boost, but the difference is usually only noticeable if the aircraft is on floats or is routinely operated in high density altitude environments (7,500’ and above).  This version also facilitates Lean of Peak operations for even greater fuel efficiency.  The Short Stack system provides about 90% - 95% of the performance increase that is possible with the Classic system with a much more attractive installed appearance.  It also makes removing & re-installing the cowl a little easier and about 5 – 10 minutes faster.  

Our standard system comes complete with everything required to complete the installation on your Skyhawk (right down to the cotter-pins) included in the box.  There are a few optional upgrades available as described below: 

Polished Finish or 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 Cessna's appearance and would rather spend your time flying than polishing, the ceramic is a nice feature to have.  Below are examples of the ceramic coating and the polished tailpipes.

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.  Power Flow's Testing of the Challenger Aviation air filter is a great complimentary product to the Power Flow tuned exhaust. We conducted our own tests to justify claims on this product and our results were as follows:

• Definite boost in MAP

• Increase of 10-15 RPM

• More power generated on take-off

• Engine was able to "breathe" better

Challenger Aviation Advertised Benefits:

• Increased horsepower

• Increase in RPM or Manifold Pressure

• Reported fuel savings of .3 to .5 gallons per hour

• Uses K&N re-cleanable air filter media

• Up to 50% more air flow with the same dirt holding capability

• NO AD's

• Installs into factory location

• Up to 25 recharges or 2500 hrs

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 Cessna'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.

Maple Leaf Exhaust Fairing

Part cosmetic (streamlines the appearance) and part performance, this fairing 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 Maple Leaf fairing also helps in keeping the ram air flow high pressure flowing down through the engine's cooling fins to the low pressure in the lower cowling and exiting. The kit comes complete with STC, all the installation hardware, spacers for test fitting and simple Installation Instructions.

Product Brochure - Click here to download 

Warranty & Guarantee

Who wants to gamble with their hard-earned dollars?  You don’t want to and Power Flow doesn’t want you to, either.  That’s why we offer three layers of protection with each system we ship:

• Product Warranty:   Every system comes with a 12 month / 500 Flight hour warranty, whichever occurs first.  If the aircraft's propeller is dynamically balanced within 25 flight hours of the Power Flow installation (before or after) 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).

• 100% customer satisfaction guarantee:  If within 60 days from the date of the first flight after installation you are dissatisfied for any reason, you can return the system to Power Flow Systems and you 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 payment was made by check, a company check will be issued. 

• And, finally, in cooperation with our network of Preferred Dealers, we are pleased to offer our:

Power Flow's Risk Free Guarantee:

We know that it works, more than 7,300 Satisfied Customers worldwide know that it works, and your local Power Flow Preferred Dealer knows that it works . . .

But, what happens if it doesn’t work on YOUR airplane?

As the name implies, this program lets you buy a Power Flow Tuned Exhaust System for your airplane through one of our Preferred Dealers, have them install it for you, and go fly with it for 60 days, absolutely risk free!   

If it works like we know it will, Great!  Welcome to the world of higher performance!

If the system doesn’t live up to YOUR expectations, or even if it does but you just don’t like all that extra horsepower, simply fly your airplane back to the Preferred Dealer (who originally installed your Power Flow).  That Preferred Dealer will:

• Remove the Power Flow System from your aircraft,

• Reinstall your original exhaust (as long as it was airworthy when removed) at No Charge,

• Refund the purchase price and installation charges you paid to have the system installed, & 

• Return the system to us at the Dealer's expense.

Power Flow will even refund your outbound shipping charges meaning that the only thing you stand to lose is your skepticism!

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)