Refined Sound. Proven Performance. The Flowmaster® Flow FX Series Muffler is the perfect upgrade for drivers looking for high performance with a moderate sound profile. Designed with a straight-through internal layout and high-temp sound-absorbing materials, it delivers a deep, mellow tone — ideal for muscle cars, trucks, SUVs, and daily drivers who want a smooth tone without excessive drone. Built from 409 stainless steel, the fully MIG-welded case is durable enough to resist rust, vibration, and high heat, while the embossed Flow FX logo and natural finish give it a clean, show-worthy look. The large-diameter perforated core supports optimized flow by reducing back pressure and unlocking extra torque and horsepower. This muffler is reversible and universal, making it easy to install in tight spaces or custom setups — from classic muscle cars and restomods to compact cars, trucks and modern builds. Features: Straight-through core for optimized flow and performance - Moderate exterior sound with minimal cabin drone - 409 stainless steel construction with a clean, natural finish - Reversible and universal design for flexible installation