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Well my setup is 60mm(2.35") all the way front to back to keep the velocity speed constant. I think this is best if you are staying NA
If you are going forced induction I would jump up to 63mm(2.5") as you want to push out more volume, velocity is less of a concern.
Most exhausts coming from Japan (HKS ect.) are going to be 60mm, American exhaust companies will be 2.5"
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