Bolt-On Horsepower     /     Complete replacement of your stock exhaust system. 

FAA approved by STC for later model AA5 Travelers (those with airframe serial numbers of 641 and higher) and all AA5A Cheetah aircraft with Lycoming O-320 engines.

Grumman’s AA5 series airframes are undoubtedly among the sportiest looking and handling aircraft in GA’s line-up.  Unfortunately, the stock exhaust system Grumman originally installed on the airframe’s rock-solid Lycoming O-320 engine leaves these otherwise fine aircraft (and their owners/pilots) struggling to keep up appearances! 

Power Flow offers you the perfect, cost-effective solution to this problem: Our “Bolt-On Horsepower” Tuned Exhaust System adds an immediate 10 - 15 Horsepower to the O-320’s output by virtually eliminating the loss caused by the restrictive design of the aircraft’s stock exhaust system. Here’s what you can realistically expect from that extra horsepower:

• An increase of 30 – 130 rpm in static thrust

• A take-off roll that is 100’ to 300’ shorter

• An improvement in the aircraft’s rate of climb by 100 – 150 fpm

• CHT’s that are 15 F – 30 F cooler across the board.

• Reduced Fuel Burn (.5 – 1.5 gph) at equivalent cruise speed

• A Service Ceiling that is 2,000’ – 5,000’ feet higher, with a corresponding improvement in performance at higher density altitudes 

So, if you like your AA5’s sporty good looks, economy, and handling, but could stand to be a little more pleased with its take-off and climb performance, you will find our Tuned Exhaust to be a very cost-effective and worthwhile upgrade. 

The Power Flow is a versatile, quality constructed, complete replacement of your entire exhaust system. The entire system is constructed of 321 grade stainless steel and includes minimal structural welds in the cabin heat section for improved safety. 

All necessary parts are included for easy installation on your AA5 or AA5A. Our customers report an average install time of between five and nine hours. The system can be installed by one of our dealers, by your local A&P, or you can fly your plane to us for a local installation. Fly in with a standard Grumman, fly out (usually the same day) tuned for performance. 

Our industry leading 60-day money back guarantee means that if for some reason you don’t see the performance benefits listed above on your Grumman 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 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.   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. 

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 Grumman’s appearance and would rather spend your time flying than polishing, the ceramic is a nice feature to have.

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.  

Product Brochure - Click here to download 

Still not sure if a Power Flow is right for you and your airplane? For complete peace of mind, check out our: 

Warranty & Guarantee

In these tough times, 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 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!