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As of now you are more limited with the E89 mod wise vs the 1 series. We are waiting for production downpipes. The JB4 will carry over and there are a few exhausts out there albeit expensive. I was going to work with ETS to make an exhaust and intercooler kit but right now I can't really be without a car for a week. Let alone what do I do with the stock equipment (lease)
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