Hushpower II Resonator - 2.25 In/Out 12L

The Flowmaster Hushpower II Resonator with 2.25-inch inlet and outlet is a premium straight-through resonator engineered to reduce drone and exhaust noise while maintaining flow efficiency in custom exhaust systems. Built from stainless steel and designed for center-inlet/center-outlet configuration, this 18-inch-long resonator combines acoustic tuning with durability, making it a preferred choice for builders seeking quieter, cleaner exhaust tone without sacrificing backpressure or scavenging characteristics.

Featuring a 12 x 5-inch oval chambered body, the Hushpower II achieves resonant frequency cancellation by directing exhaust gases through internal tuning chambers that absorb specific noise frequencies while allowing exhaust to flow straight through the unit. The 2.25-inch center inlet and outlet accepts standard tubing without additional adapters, and stainless steel construction provides superior corrosion resistance—critical for vehicles exposed to road salt, moisture, or high-temperature cycling. With a compact weight of 6.35 lbs and modest 6 x 5 x 25-inch footprint, installation flexibility is maximized without compromising acoustic performance.

This resonator suits custom exhaust builders, street rod enthusiasts, and performance vehicle owners who need cabin noise reduction without restrictive muffler backpressure. It's particularly effective in systems targeting 2.25-inch diameter piping and works well as a secondary silencing stage ahead of or behind a primary muffler. Flowmaster's Hushpower II line is recognized in the aftermarket exhaust community for balancing acoustic results with minimal flow penalty—ideal for naturally aspirated and moderately modified engines where both sound quality and performance matter.