Gilles LeClair
Well-Known Member
I believe the j35 tb and oem si tb have the same inlet diameter. I just measured my stock tb at 67mm
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From another post -
The J35 TB is 68mm from the intake side tapered to 65 mm to the IM
I was more concerned about the 4 bolts from the TB lining up with the IM
If the J35 TB has a wider opening, i'll have it port matched. Heard it might not do much but might as well do it while its out.