It seems to be giving off a lot more exhaust smell and after install , I started the car and hit the throttle and it revved up nicely and stalled out. It only happened upon first start. Took it for a test drive and everything seems good. That just worried me. I did not think it would suck so much air that you can hear it doing so. That is pretty cool. I know I sound like a newbie, I am not a mechanic and am new to this.