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BMS PBX
Just bought a used BMS powerbox used for 200$. Planning to install it along with K&N drop in filters. Car is a 328xi AT completely stock. Just wondering, should i sell this unit now and spend 400$ for the AA tune, or just stick with the PBX for now? Kinda hesitant to spend the extra money, but if it's worth it, i will. What do you guys think?
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