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Hey guys, I'm having a major problem with my new exhaust and I wondered if anyone else has experienced the same problem and what they did to fix it. I have an 03 Ex coupe and after I had the exhaust installed, it will rattle and vibrate violently right up near the cat. I know its around there cauze you can feel it come up through the floorboard right underneath the shifter. I jacked up the car and found everything to be very solid and tight. Nothing looked out of the ordinary. There was nothing that was touching or anything that would cauze a vibration. Could someone please help?!? It feels like my car is going to vibrate right apart if this continues. It feels even worse if you are sitting in the passenger seat. This will happen under acceleration, cruising and idle. It is really embarrassing when you have a decent looking car sitting at a light and you have an exhaust clanking underneath the car. Thanks for any advice.

 
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I have the same problem, it's most likely hitting the heat shield ... either bend the heat shield or take it all off and put it completely back on (hopefully shifting it will fix the problem)

 
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it could be ur catalyc converter-gone bad.