Heres the story my buddy has a 96 teg ls w/ auto and hes wants to make it faster but doesnt want to make his car sound like a race car. He already has the intake in there but i keep telling him to put on an exhaust system for some nice gains but he doesnt want to have it LOUD. Is there any way he can make more power without the noise? without an exhaust will he get power from anything else?