I was planning on running a GSR motor with a skunk2 IM which if I'm not mistaken has a 64mm opening. Now my question is this... I've seen people say to match that 64mm size and some port match and others use different throttle bodies... so far I've heard that the b16 and b18's TB's are 58mm and 60mm, the itr's is 60 and 62mm, the jdm itr's is 64mm, the s2000's is 62 and 64mm and the h22's is 62mm. If anyone knows the correct numbers for certain, can they list them.... thanks.

B16
B18c
B18c5
H22a
F20c

 

GSR is 60mm.
ITR is 62mm.

 

B16 a1:58 a2:60
B18c 60
B18c5 62
H22a 60
F20c 62

 

Thanks... Since they're all 60 or 62mm, it doesn't really matter which you buy then if you're going with an aftermarket manifold like the skunk2, right?

Also, are the JDM tb's the same size as the USDM ones?