ull see a gain of a few ponnies in the top end

works great when ur running 15psi

 

What intake manifold is it? A skunk 2?

I could tell by looking at my skunk 2 manifold that a larger throttle body would make a difference, but not nearly as much as what the d16y8 would (seems like the reservoir for the air inside the manifold is better balanced on the skunk2 version; hence probably why it flows better).

 

My buddy bores out throttle bodys, and he was doing some comparisons on a dyno with a S2000 w/ a comptech supercharger. It gained 11whp with a 4mm oversize bore on the throttle body.

I run a 64mm T-body on most my setups, but jumping up to a 78mm on my next one.

 

I need to put a larger one on my car too...stock is 54 or 56mm i forget. I'll probably upgrade to a 62 if I can later

 

Holy ----! I used a 68mm and my little B7 loved it. I had to bore the ---- out of the stock manifold to match it. I guess you have that custom manifold that might fit a bigger TB? I can't see a stock manifold being bored much farther than 68mm. That was almost the size of the plenom as it was. Any bigger and it would have made a bottle neck type design.
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YYo jeff, i have an rpm tb, i believe its a 72 mm if ur interested, U can fit ur fist in this thing