Improves airflow up to 176%. Monster Performance & Modest Price. Banks' new Monster Sport Exhaust is one cool cat-back system! And its low price? That's way cool. The system slashes backpressure, increases exhaust flow, improves fuel economy and delivers extra power to your rear wheels. Exhaust tip optional. 4 inch constant-diameter cat-back exhaust system. Virtually eliminates backpressure & nearly triples flow! Lowers exhaust gas temps. Straight-through Monster Muffler delivers a commanding exhaust note. Stainless Steel. Easy install. 5 inch rolled-edge polished tip is optional. Fully compatible with the Chevy/GMC factory warranty. 5-Year Limited Warranty.