Bolt-on Horsepower. Complete replacement of the exhaust system for Lycoming O-360 engines.

Power Flow does not offer an STC'd kit for the C-170, but several Customers have purchased our STC'd kit for the O-360 powered Cessna 172 and installed it on their O-360 powered C-170's under Field Approvals issued by the FAA.  Upon request, Power Flow will, at no charge, provide you with copies of those prior Field Approvals as well as the STC holder's permission letter that needs to be included with your application.

If the Field Approval route is something you would consider, we recommend that you (or, even better, your A&P / IA) contact your local FAA FSDO to see if they would be willing to give your application for a Field Approval a fair hearing.  If they are amenable, attaching copies of the prior Field Approvals to your application is usually all it takes to receive a prompt (usually within 30 days) approval for your own installation. It is best to apply for and receive the Field Approval prior to ordering the system from us to save time and avoid wasted effort.

We would then sell you one of our standard kits for the O-360 powered C-172 under a [Conditional Sales Agreement]. In place of our standard 60-day money back guarantee, this agreement gives you 90 days from the date we ship the system to have it legally installed on your airplane.

If you are unable to fit the system on your aircraft, or if you are unable to obtain the Field Approval for the installation, you may return the kit to us for a full refund of your purchase price, as long as the kit is complete, undamaged and unmodified. Please note that shipping charges are not refundable, and we do not refund any labor charges incurred while trying to install the kit.

Upon completion of the project, you can expect the same performance benefits enjoyed by our several thousand satisfied Cessna Customers: 

The Power Flow is a versatile, quality constructed, complete replacement of the entire exhaust system for your Cessna 170. 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. 

Our industry leading 60 day money back guarantee means that if for some reason the performance benefits listed above fail to materialize on your -170, 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. 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. 

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 170’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.  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.

Product Brochure - Click here to download

Warranty

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. 

Power Flow strongly recommends that a Dynamic Propeller balance be performed on the aircraft in conjunction with the installation of the new Tuned Exhaust System.  If the propeller is dynamically balanced (vibration lower than 0.20 IPS at a minimum of 2000 RPM) within 25 flight hours of the installation of this 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.