Improves airflow up to 122 percent. Monster Performance Modest Price. Banks new Monster Sport Exhaust is one cool cat - back system And its low price Thats way cool. The system slashes backpressure, increases exhaust flow, improves fuel economy and delivers extra power to your rear wheels. Exhaust tip optional. 4 in. 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 in. rolled - edge polished tip is optional. Fully compatible with the Dodge factory warranty. 5 - Year Limited Warranty.