i had a loose heat shield and took it off but no it was not the problem. but the caty.. converter thing, when i hit it, it make a nasty metal noise. do u guys think thats the problem? I can't stand the sound any longer, sounds like a POS right now lol. I'm just hoping it's not the engine. but most deff.. I hit the Catly..Conv.. and it makes a load crappy noise.