Quote:
Originally Posted by dwx
It's not popular at all, because it's difficult to tune and make work correctly.
Those aren't ITBs, those are what they call TGVs (Tumble Generator Valves) and they come AFTER the original single TB. They were used on the WRX/STI for emissions reasons, they create an obstruction which swirls the air and creates more complete combustion when the engine is cold/during startup. When performance levels get high enough most WRX/STI owners remove them. The JDM EJ207 engines do not have them.
As for the BHP/WHP debate it would take Litchfield to answer that question. Either way you just have to look at the % gain versus the raw numbers. The stock 1/4 mile trap speeds most magazines and some users on here have run are consistent with it having right around 200hp.
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Which magazines have a review of this setup?