Mods: AEM Cold Air, AEM Fuel Rail, AEM FPR, Spoon 4-1 Stainless Header, Spoon Test Pipe, Apex-I World Sport Exhaust, Intrax ARS Coil-Overs, Mugen Upper Front and Rear Strut Tower Bars, Benen Rear Lower Tie Bar, Spoon Front Lower Tie Bar, 16" Spoon SW-
Somebody else already posted a thread like this, but I will answer this one anyway. The USDM is 2.25" and the JDM is 2.5" at the collector. As for aftermarket headers, the standard DC's are 2.25" but they make a JDM header that has a 2.5" collector. The Comptech is 2.25", the Spoon, Mugen, and Toda are all 2.5"
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Nighthawk Black Pearl 2001 ITR #052
Clockwork Motorsports
Temecula, CA
Mods: AEM Cold Air, AEM Fuel Rail, AEM FPR, Spoon 4-1 Stainless Header, Spoon Test Pipe, Apex-I World Sport Exhaust, Intrax ARS Coil-Overs, Mugen Upper Front and Rear Strut Tower Bars, Benen Rear Lower Tie Bar, Spoon Front Lower Tie Bar, 16" Spoon SW-
I do believe that the primaries are 2", although I am not sure. I do know however that the primary size in the USDM and the JDM ITR are the same as the CTR.
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Nighthawk Black Pearl 2001 ITR #052
Clockwork Motorsports
Temecula, CA
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