looking for cat back exhaust or a test pipe/ reducer for my gsr. I have some headers going on that are 3" at the output, but I don't really want 3" piping all the way back. if anyone can help me out I appreciate it. one issue I have though, is the bracket that bolts the headers to the cat is at a different angle from the factory headers. I first thought maybe they were b16 headers but wouldn't they not meet up right at the head? any suggestions?