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It's been proven that a 3" exhaust makes a lot more power then a 2.5" does. However, with the larger piping comes a lot more noise. Granted some quality exhausts out there have a decent sound despite being 3", it's still goign to be significantly louder then a 2.5"
Given this, I'm still sticking with a 2.5" HKS Hi-Power exhaust when i'm ready.
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