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Originally Posted by Mr.Metak2you
Oh this is gonna be good! Zero sarcasm. The sound comparison between the cars (E90m3 vs. M4) with the same exhaust is gonna be epic.
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I hope so I'm just wondering how to get the valvetronic system to work, I was considering connecting it to the power button to open the valves but I don't know if I should do that or have a separate switch? Any suggestions