I got the parts from evasive. Spoke to the person he said the part would fit. Its the Berk test pipe. He says my mugen headers is 60mm and the Berk is 63.5mm I believe.

 

I was tightening my spoiler but and dropped the bolt. Now I can't find it. Haha where the heck can it go? I move to trunk but no sign of it. Did that thing fall into a black hole? Could the sounds/rattle be from the bolt getting into some area? And I've recently went to an audio place to have my audio system looked at. I'm thinking the passenger panel might have had something lose in there and the darn bolt. I've recently retighten every bolt on the test pipe. It seems to help a bit. But I honestly think the sounds might not be from the test pipe.

Anyone know what are typical sounds or things that can happen from test pipe installs? Would they be rattling? Any input would be great and apprecitated. I'm going to take in the car for them to take a look at the passenger door.