I also have the MSA 6into1 header, premium exhaust. Header fit fine, but problem happens with the middle pipe that bolts to the header hitting the trans support. The rear flanged pipe is not a great fit either, but again I think it is due to the first pipe not fitting properly. I e-mailed MSA and they wanted pictures of the problem. By the way I ordered the MSA exhaust 12-15-07 and received it 4-10-08. I should have known better when I ordered the exhaust and just taken the car in to a local exhaust shop.