Stock piping is not 2.25". What I refer to when I say bottleneck, is that you're still going to have OEM size exhaust piping which is small and restrictive, and then a 2.25" rear section. The OEM B pipe will restrict your flow enough that the rear section won't help as much as a full catback. Mandrel bending is effective to any aftermarket exhaust...not just for forced induction.
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