JB3 Stage 1 is compatible with the X3, but not Jb4 Stage 2... Terry @ BMS doesn't have any plans to support Stage 2 for the X series or 535 as of yet...
RSI Tuning has a DP for the 535 which is compatible with the X5, not sure if it'll work with the X3... Check em out
I just got a Custom FMIC installed this past weekend (at the same place that did my Custom Exhaust)..
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BMW X5 35i: Boopie Exhaust & Intercooler, K&N Drop in Filter, JB3 (3+ psi)
2013 Dodge Challenger R/T: CAI, Catch Can, Custom Exhaust, Headers, 87MM Throttle Body, Diablo Custom 93 OCT Tune
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