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blue - i get that it lowers losses to have larger pipes up to the constriction; my question is that, if the throttle body is the constriction, why did porsche put it in the system at all?
regardless, the ipd dynos show that a larger throttle body with a better-designed plenum is a winner on the 986 (the 987/cayman have a resonance flap on the oem plenum that is removed in the ipd product, hense i think the poor low rpm performance on the ipd kit for these cars).
the idea is to make the ipd product without the ipd $. as has been pointed out, the pedro product is flawed in that it doesn't address the turbulent flow that occurs on the inside radius of the 'T'.
the best solution i see is to fab a 'Y' pipe out of silicone that mates to the flange/aos end of a cayman plenum and throttle body.
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