I have one on my Z31 with a full 2.5" exhaust and muffler. Maximizes exhaust porting while maintaining back pressure for the N/A engine. Still sounds good, gives you a noticeable HP boost. Maybe 15-20, and of course why I bought it in the first place to pass the emissions! Laugh out loud. Must be welded, non-directional, 2.5 on both sides.
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