My Camaro has a 3in X pipe into 2.5 mufflers and tailpipes. This is with a supercharged 355. I've had fitment problems in the past, worse when mini-tubbed, with 3 inch tailpipes. I did a lot of searching before I bought anything. I think this is the best compromise. I don't think it gives up any noticible power. It's also quieter than full 3 inch systems. When I'm in boost that's a good thing.
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