DON'T!!!!!!
Coming from a heavly modded WRX, don't even think about making those upgrades without re-tuning the engine mapping! By changing the turbo, YOU CAN BLOW YOUR ENGINE, TURBO, Tranny, or anything else in the driveline. Wait till you have the cash to tune after making mods like that. Take it from someone who learned the VERY EXPENSIVE WAY!!!!!!!!!!!!!!!!! Good Luck!
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Mike Jankowitz
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