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The F90 JB4 and BMS F90 Stage1 tuners both go on and off without an obvious trace. The JB4 has the extra ability to read/delete fault codes including hidden faults. Most importantly both are highly reliable products. It just depends how much power you want to add. The BMS Stage1 maximizes the power gains possible with the TMAP only connections so it's a great starting point for most. The JB4 is for those who want the absolute highest quality and performing tuning and most available features.
Mike
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