Muffler 3.5in Inlet 3.5 in Outlet Anti-Reversion

The Schoenfeld 3.5 Inch Inlet 3.5 Inch Outlet Anti-Reversion Muffler (Part No. 112735AR) is a high-performance exhaust component engineered for serious engine builders and performance enthusiasts. This anti-reversion muffler is specifically designed to eliminate exhaust gas reversion—a condition where spent exhaust pulses backflow into the cylinder during valve overlap—which degrades power output and combustion efficiency. By preventing reversion, this muffler allows the engine to breathe more effectively across the RPM range, resulting in improved horsepower and torque delivery.

Constructed from aluminum with a durable black paint finish, the muffler features matching 3.5-inch inlet and outlet ports for seamless integration into custom exhaust systems. The 4-inch diameter body and 11-inch length provide optimal internal volume for effective sound attenuation while maintaining low backpressure—a critical balance in performance applications. This compact footprint makes it suitable for tight engine bay installations common in vintage race cars, street rods, and custom hot rods. The anti-reversion internal design works by using tuned passages that allow exhaust gases to exit while preventing pulse reversal, making this muffler distinct from traditional absorption-style units.

This component is ideal for builders constructing header-back exhaust systems on carbureted or fuel-injected engines where maximum flow and reversion control are priorities. The anti-reversion muffler technology is particularly valuable in small-displacement and high-RPM engine applications where exhaust scavenging efficiency directly impacts performance. Weighing 2.48 pounds, it adds minimal mass to the vehicle while delivering measurable power gains compared to stock restrictive mufflers or inferior anti-reversion designs. Serious performance shops and experienced fabricators specify Schoenfeld anti-reversion mufflers for their proven ability to enhance engine breathing and deliver consistent, repeatable results on the dyno and the street.