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from what i hear 2.5 (63.5mm) is ok i personally wouldnt go any bigger unless you have plans for some boost i know there are a few people with our cars running with just header that run ok too
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04 TSX PWP AT
Fujita CAI, TB Coolant Bypass, Hondata IMG, P2R TB Spacer & Gaskets
98 Camaro Z28 M6
Intake, Headers, 4.10 Gears, Ram Air, Intake Manifold
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