Vibrant Performance Straight Reducer Silicone Tubing Coupler - 4 in to 3-1/2 in ID - 3 in Long - Black JKU-GMR25 The suede covered rim is

The suede covered rim is anatomically molded for optimum grip

If applicable

1971-1974 GMC P25/P2500 Van

it features internal processing to read data from OBDII and most aftermarket ECU and EFI systems

Trak-Jax are available with or without a 1

Vibrant Performance Straight Reducer Silicone Tubing Coupler - 4 in to 3-1/2 in ID - 3 in Long - Black JKU-GMR25 The suede covered rim isVibrant Performance Aramid Reinforced Silicone Transition Hose Couplers feature a smooth and effective transition from one inlet diameter size to another. This coupler is intended for use in applications where a reduction or increase in diameter is needed. Our Transition Hose couplers are commonly found off of turbo compressor housings, intercooler end tanks and charge pipe assemblies. Rated for temperatures ranging from 65 degreesF to 350 degreesF