Schoenfeld Racing Muffler - 9" Length - 3-1/2" Core Diameter - 3-1/2" Diameter Inlet, Outlet - 4-3/8" Body Diameter H777C08XS This system's dyno-tuned intake tube

This system's dyno-tuned intake tube maximizes airflow and velocity

4-3/8 in Diameter

1-1/4 in 19 Spline

The result is that the air entering the filter is cooler

Schoenfeld Racing Muffler - 9" Length - 3-1/2" Core Diameter - 3-1/2" Diameter Inlet, Outlet - 4-3/8" Body Diameter H777C08XS This system's dyno-tuned intake tubeSchoenfeld mufflers provide economical sound reduction. Check with local sanctioning body to ensure what sound requirements must be met. May not be legal for some sanctioning bodies race tracks. Started in 1974, Schoenfeld is known for custom fabricated headers for all forms of circle track racing. Schoenfeld Headers is the worlds largest manufacturer of circle track headers, but they specialize in a variety of high quality exhaust parts, including