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i feel like even doing all those things i might net another 25hp or so since I'm driving the z4is, kinda making me regret that buy haha i mean how much more boost can i safely add above them? probably 2-2.5psi thats like 25-30hp so i don't know if its worth it to drop near 2500 to make that power, thats 100$ per horse power. (without exhaust and wheels)
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