3in x 4in Concentric (st raight) Reducer

The VIBRANT PERFORMANCE 3in x 4in Concentric Straight Reducer is a precision stainless steel exhaust transition component engineered to step down from 4-inch to 3-inch diameter piping in custom exhaust systems. This concentric reducer maintains a centered bore axis throughout the transition, ensuring smooth flow characteristics and minimizing turbulence in high-performance applications where exhaust velocity and scavenging efficiency directly impact engine output and thermal management.

Constructed from stainless steel, this reducer accommodates applications requiring reliable diameter transitions in custom exhaust builds, turbo installations, and performance tuning systems. The straight concentric design—as opposed to eccentric reducers—maintains proper alignment with the exhaust centerline, critical for vehicles where header clearance and suspension geometry leave no tolerance for offset piping. Weighing 1.03 lbs with compact overall dimensions of 5.3 x 4.25 x 6.55 inches, the VIB2632 integrates seamlessly into tight engine bay configurations common to sport compact, import, and modified street vehicles.

This component serves fabricators, engine builders, and powersport enthusiasts building custom exhaust systems where OEM piping diameter transitions are unsuitable for aftermarket manifolds, turbos, or downpipes. The stainless construction resists corrosion from condensation and exhaust chemistry, important for vehicles subject to extended storage, high-altitude operation, or salt-air exposure. Vibrant Performance reducers are specified in dyno shops and tuning facilities where flow optimization and structural integrity affect measurable performance gains.

When sourcing 3in x 4in concentric straight reducers or exhaust diameter transition fittings, verify OD/ID specifications and flange type compatibility with your existing piping before ordering. The VIB2632 is a universal slip-fit component; welding or clamping hardware is not included and must be selected based on your specific piping gauge and installation method.

SKU VIB2632 | UPC 690092190279 | MPN 2632