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Gotta call BS to at least one of those claims. The JB4 (plug in tuner) does not compromise Air/Fuel ratio. In fact, there is zero difference in A/F with and without it.
And it's -75% less expensive.
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'14 550iX M-Sport | BMS Tune | M5 Exhaust & Diffuser | 20" 601's | Beltronic STi+ | L.I. Quad | Color Matched Everything...Carbon Black |
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