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It would be a track day car, maybe with misfireing system. We will see in the future. Piggyback or stand alone. Maybe You're both right, I need to do research and think twice before I will start doing this. Better to spend some more money on common mods, then do the experiments. Anyway...

Lets take 1" and 5" butterfly, and open them for about 20%, I think the bigger one will have lower flow resistance, and in result better throttle response (I think, I'm not a master of science. just poor student :P ). BTW: Head will be prepared, intake plenum will be bigger, custom made and...

S=Pi*r^2 S for supra tb, diameter is 60mm, so radius is 30 S=Pi*30*30= 2826mm^2 Bigger one, lets try 70mm S=Pi*35*35= 3847mm^2 No lets try DTB, one stock supra 60mm (S1), and one from prelude 55mm (S2) S1= 2826mm^2 S2= 1589mm^2 S=S1+S2= 4415mm^2 Now You can see why. Same results with itb...

I've an idea What do you think? I need to do a intake manifold, so it is no problem to make it like this. 2 throttle body's = better flow, better throttle response ? I think it will work preety similar to ITB.