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I don't even have a M5 and Im already done this entire thread lol. Im thinking of selling my X6 Activehybrid and if I do, I'll either pick up a 2013 CLS63 or 2013 M5. With the AMS tune, which one would be faster with just the tune?
I will probably get catless dp and an exhaust down the road but my first mod would 100% be the ecu tune.
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