Comparing IMCA Mufflers Stock Car Racing - J J Motorsports
Comparing IMCA Approved mufflers
Which IMCA Schoenfeld Muffler Do You Need
There are 3 main IMCA mufflers. The Schoenfeld IMCA609, IMCA930, and IMCA935. In this guide learn the specs associated with each part number such as length, inlet size, and outlet size to determine which fits best for your application. These mufflers are common for dirt street stocks, dirt modifieds, and more race cars requiring the IMCA approved mufflers.
IMCA609
The shortest and lightest muffler of the 3 is the IMCA609 measuring 6 inch in total length end to end. Features a 3 inch inlet and 3.5 inch outlet.
Specs:
Overall Length: 6 Inch
Inlet Size: 3 Inch
Outlet Size: 3.5 Inch
Weighs: 1.37 lb.
IMCA930
The 930 muffler is 9 inch in length from end to end and features a 3 inch inlet AND 3 inch outlet.
Specs:
Overall Length: 9 Inch
Inlet Size: 3 Inch
Outlet Size: 3 Inch
Weighs: 1.95 lb.
IMCA935
The 935 muffler is the largest and heaviest muffler out of the 3. The 935 is 9 inch overall length and features 3.5 inch inlet and outlet.
Specs:
Overall Length: 9 Inch
Inlet Size: 3.5 Inch
Outlet Size: 3.5 Inch
Weighs: 2.3 lb.
*Check with your track rules BEFORE determining which IMCA mufflers you need
Recent Posts
-
Single vs. Double vs. Triple Pass Radiators
Single vs. Double vs. Triple Pass Radiators: Which Is Best for Your Dirt Track Race Car? When you'r …Oct 1st 2026 -
Best Engine Oil for 602/604 Crate Racing Engines
Best Engine Oil for 602/604 Crate Racing Engines Quick answer: There is no single "best" oil for 60 …Aug 31st 2026 -
Street Stock Spring Free Height & Diameter Guide
How to Measure Spring Free Height & Diameter for Dirt Street Stocks When you’re replacing springs o …Aug 25th 2026
