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Most of the talk here is around BM3. Does anyone have experience with JB4 performance vs BM3? I like the idea of being able to take the JB4 off so the dealer can't tell.
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2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
2016 F15 50i ///M-Sport
BM3/H&R/Borla
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