When my car was bone stock i raced my buddies modded LS1 from a roll at 40 to 110 and i could only manage 1 length on him at the end,:fm:then i put a cold airkit and magnaflow exhaust on and raced him again from the same 40-110 and i pulled him 4-5 lengths with nothing else changed.:-D My car has lost no bottom end torque that i could feel,it spins the tires alot more now than when it was stock.
