i was gone for the weekend and needed to get my oil changed so i had my dad take it in, well when i got bak in my car today it runs fine, but the exhaust sounds different, its louder throught all rpms, and it sounds deeper, this might not be bad, but at certain rpms it resonates through the car, and sounds ****ty. I have shorties on it with an offroad h-pipe and flowmasters. any ideas on what could have happend, maybe theres just an exhaust leak now, i gotta chek that out soon