Add these Smooth Bellows to your LS1 F-Body and pick up some easy horsepower! This piece replaces the restrictive accordion-style factory bellows, straightening out air flow between the MAF sensor and throttle body for an increase of up to 6 horsepower. A single-rib design allows adequate flex while posing minimal restriction. The Smooth Bellows are constructed of high quality, fiberglass-reinforced silicone.