I just recently got a custom exhaust on my 98 OBS and it didn't turn out to good. I got a Megan Racing 4.5 Muffler with 2.5 inlet and brought to a local muffler shop to get it built. I just noticed when my car was on jacks that 2 of the welds have leaks and the guy used no hangers at all and just put a small spot weld on the muffler to the bumper, and also the piping he used is just about the same size as the stock piping. So their's no power gains at all. If anyone knows of any companies that make an ehxuast for my car or is selling on P'M me or let me know. Thanks.