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Throttle body

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Old 08-Nov-2006, 07:36 AM
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Throttle body
Is it possible to take a stock gsr throttle body and bore it out to 68mm or 70mm? who could do this for me, how much approx?
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Old 08-Nov-2006, 10:15 AM
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im pretty sure the max you can bore out that TB even ITR/SIR Tb's is 64mm.
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Old 08-Nov-2006, 10:25 AM
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I am not sure what the max bore is, but you need to port match the intake plenum opening to make it beneficial.
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Old 08-Nov-2006, 11:25 AM
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you can only bore our throttle bodys out 4mm.
But you could get a taper bore of 66mm down to 64mm.
His skunk2 IM should have a larger plenum opening, most aftermarket IMs do.
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Old 08-Nov-2006, 11:25 AM
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well im running the skunk 2 intake manfold i think which is 68mm or 70mm but i have a stock throttle body which is resticting air flow aright now.
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Old 08-Nov-2006, 12:06 PM
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Ah I see.
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Old 13-Nov-2006, 03:32 PM
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Unless you get a Type-r TB and bore that out cause it comes in a 62mm. Wouldnt you be able to bore that out to a 66mm? Is that possible?
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