Bolt-On Horsepower     /     A complete replacement of the Mooney M20 exhaust system. 

FAA approved by STC for use with M20 E, F, & J models with Lycoming IO-360 or IO-390 engines. Power Flow offers configurations compatible with 200 HP Mooney’s equipped with either the stock Mooney cowling (Our Gen 2 system) or the LoPresti cowling (Gen 1 system). The Gen 1 system also accommodates M20-J models equipped with electric cowl flaps.

"We will be building highly-refined versions of the M-20 airplane in the year 2000." -- Roy LoPresti, president of Mooney Aircraft, 1985.

Turns out the esteemed Mr. Lo Presti was way too conservative! Although there have been a few hiccups through the years, according to Wikipedia, there were over 11,000 M20 airframes produced across three production runs, with the most recent one conluding in 2019!

Many consider the 200 HP versions (including the M20-J, vastly refined and improved by Mr. Lo Presti during his tenure at Mooney Aircraft into the superb “201”), to be the epitome of performance and efficiency envisioned by Al Mooney with his original M20 design from 1955.

Our well-proven Tuned Exhaust System (now installed on well over 600 Mooney’s worldwide) gives your bird the superlative performance to match its rakish good looks and impressive pedigree!

Similar technology has been used in race cars and motorcycles for years, now it is available for your Mooney. By more effectively emptying the cylinders of spent exhaust gases, our Tuned Exhaust System immediately gives your aircraft the following performance improvements:

The Power Flow is a versatile, quality constructed, complete replacement of your current 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 M20. Our customers report an average install time of between four and seven 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 Mooney, fly out (usually the same day) tuned for performance. 

Our industry leading 60-day money back guarantee means that if for some reason the performance benefits listed above fail to materialize on your Mooney, 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. 

Do you need a Gen 1 or Gen 2 Power Flow Tuned Exhaust?

Both versions have the same measured performance gains. The Gen1 version is designed to fit inside the tighter confines of LoPresti cowled Mooney’s and includes additional components to accommodate the electric cowl flap mechanism if necessary.

• Order the Gen 1 version if your aircraft is equipped with either the LoPresti cowling OR (on the J Model) electric cowl flaps.

• All other E, F, & J models use the Gen 2 version. This is specifically designed for your Mooney cowl with manual cowl flaps.

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 Mooney’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. 

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 your Mooney’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.

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

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!