Cessna 150 Muffler STC for the Cessna 120/140/140A

No AD Notes!

Less Maintenance!

More Cabin Heat!

Better Parts Availability!

Most of the old ‘straight stack” and ‘pancake’ mufflers have had so many thermal cycles (hot-cold during engine operations), they are no longer repairable by welding. Time is taking its toll on them. There is an AD (48-25-02) that requires inspection of the weld joints on the ‘pancake’ mufflers every 25 hours of flying.

Now is the time to upgrade to the Cessna 150 Exhaust System.

There have been three different series of C150 styles that were manufactured by Cessna. This STC will allow the use of any of the three and can be used on the C85, C90 and O-200 engines.

Cabin heat output is generally much improved.  Servicing the muffler system is much easier because the newer style clamps don’t require that both exhaust gaskets to be ‘precisely’ aligned at the same time (per the older styles) when the mufflers are re-installed after removal for inspection.

PRICE: The cost is US$100 for members of the International Cessna 120/140 Association. Non-member cost is US$150. (Membership in the Association is only $25 and you can join online at www.Cessna120140.com.  Link to the Association) 

The Taildragger Aviation C-150 Exhaust STC gives you the authority to install one set of Cessna 150 exhausts on one specific Cessna 120, 140 or 140A with a C-85, C-90 or O-200 engine. This is a one time use STC, is N number specific and is NOT transferable. 

The STC includes paperwork and installation instructions. The STC is paperwork only, and does not include the exhaust or installation hardware. For a list of possible Exhaust suppliers, see the Muffler Sources page.

The cost of the STC is US$100 for International Cessna 120/140 Association Members, and US$150 for non-members. (Membership in the Association is only US$25 and you can join online at www.Cessna120-140.orgDirect link to the store)

If the form does not work out,  Please send us an email using this link:


Please include the following: Your Name and address, Phone number and email address,
The N number of the plane the STC will be installed on,
Shipping address if different than the registered address of the airplane,
What type of engine, C-85/C90/O-200, and Association Member number

Be sure to include your contact information so we can get ahold of you for any questions.


After you contact us, we will let you know payment information.


New and Used Muffler Sources.

This list is not all-inclusive. If you know of another source 
for Cessna 150 Exhaust and Mufflers, please let us know.

The following companies have indicated that they have Cessna 150 exhausts and mufflers available for sale or can repair your Cessna 150 exhaust:

Dawley Aviation
140 Industrial Dr.
Burlington, WI 53105
New Exhaust systems and repair

Aerospace Welding, Incorporated
1045 Gemini Road
Eagan, MN 55121
New Exhaust systems and repair

The Parts Exchange, Inc.
2062 Carolina Place Dr.
Fort Mill, SC 29708
Local and International calls: 803 548-2665
Fax: 803 548-6360
New Exhaust Systems
The Cessna 150 Exhaust STC system

Preferred Air Parts
Mail… P.O. Box 12
Delivery… 11234 Hackett Road
Kidron, Ohio 44636 USA
New Surplus Exhaust systems and new Exhaust parts
sales@preferredairparts.com www.preferredairparts.com

Original Straight Stack Exhaust

Old Style 'Pancake' Mufflers

150 Mufflers installed on a Cessna 140A