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How come no one is mentioning the obvious? SPT intake is great and extensive testing by COBB tuning has shown that on the STI and WRX (but not the Legacy GT, though) that the SPT intake is at least equal to if not better than the stock airbox. I'm running a SPT intake, GFB BOV on 100% vent with a catless TBE (using COBB AP), Perrin LW pulley and a LW flywheel with no problems at all.
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