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I've had the MS Stage 2 for about 2 months now and no issues. It actually changed up my stock exhaust sound a bit, a little throater, sounds nice. Not sure the stronger pull I feel is in my head or actual although they do claim 8-12hp gain, but I didn't dyno before or after so who knows. I like it and that's all that matters.
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2006 E85 Z4 3.0si
2015 F10 535i M Sport Sold
2011 E92 M3 Sold
2007 E90 335i Sold
2006 E90 330i Sold
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