is it 64mm? should i look for something bigger for my b18b?
i already have head work done, crower 403 cams, 11.5:1 CR. this summer i will be adding: JDM header, 2.5inch cat and exaust, RC 310cc injectors, skunk IM, and a TB (not sure what size though)
thanks

 

from what i have been told a honda tb cannot be bored out more then 4mm oversized, so if i did that to mine i would be at 62mm, and i would like to go to at least 64mm, i was hoping that the itr would be 64mm, i can't really find an aftermarket tb that is 64mm, the next size i see is 68mm, would this be too big for what i want to do? thanks

 

yea i think 68mm will be a little to big for a non vtec but if you p+p ayour head and manifold you should be able to take advantage of it, btw i thought the itr t/b was 64mm too, oh well i'm getting a 70mm erick's racing t/b anyway

 

I think 68 mm is a lil big. Just get an ITR TB and overbore it to 66 mm.
4 mm is the maximum you can overbore like someone already said.
I would put a stock ITR TB and see how that feels before overboring it, IMO