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Never finishes (TWSS)
91 Civic SI hb
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1,880 Posts
Any size you want if you make an adapter plate for it. But then there is the size of the opening in the plenum so really as big as you can bore that out before you lose your iacv ports. Probably a 70-75mm is the biggest really.
 

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I actually had it. On the 70, past 50% was pretty much the same.

60 feels about 80-90% useable

56 feels a little small but it matches my IC piping.

I think it's retarded having a TB bigger then your IC piping.

It's a Air restriction plate.

Or throttle body for the slower people
 

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Retired From Hondas
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2,796 Posts
OK, cuz Im using a 68mm and my piping is 2.75.. So its just something now in the back of my mind.
 

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If i remember correctly you can use teh throttle body off of a B18a1 or b18a2 it will give you a lil bit better throttle response at all rpm's
 
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