when i had my stock exhaust i could not rev the car in nuetral or parked because the car would just sound like someone was throwing rocks at sheet metal. so i a stainless steel exhaust system put on with 2 flow master 50 series and resignator delete to a mid pipe. now i can somewhat rev the car without hearing the noise it sounds real deep and mean until i get to about 2300 rpm to 2500 rpm it gives me a loud "fartcan" ish noise but as soon as i pass 2500 rpm its gone. im just a little confused its not the cat converter because it doesnt do it while idoling or any other rpm and it doesnt have a bad smell. so any ideas what it could be? possibly the heat sheild
