big exhaust = less exhaust gas velocity which at lower rpm will not be as beneficial as a 2.5" unit. If you can max out the flow capabilities of a 2.5" i would be very impressed.
BB6 Prelude H22A4 CP 11.5:1 pistons, eagle rods, shaved deck 12.3:1 comp, Type S cams, lovefab header, s200, 65mm TB, 2.5" through... NA WARRIOR
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