I was measuring the TB size and comparing the insides earlier.....unless I was REALLY off on my measurements they have the same size TB....only internal difference I could see was that the B18B TB had 2 idle air passages and teh B16B only has 1. I did not have a metric measuring tape or internal micrometer though....had to use a crappy American Standard tape.

 

Hmmm. Interesting. Mine came w/o a TB so I dont know either...

Arent ITR and CTR throttle bodies the same?

 

I dunno......I don't have an ITR TB to measure. I'd say its an even bet that they are.

 

As far as I know, the B18B uses a 60mm throttle body and the B16B uses a 62mm throttle body.

 

Ah......I see. Like I said I had a crappy *** American standard measuring tape......2 mm is a small enough amount that I could easily have missed it with such an imprecise tool.

 

61.5mm at opening and 60mm after the plate on a b16a2 tb...measured with a digital micrometer