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JB4 on the IS
They just released IS specific firmware for the JB4. It boosts PSI in the middle ranges over the current firmware & also changes the AFR to better support this version on the N54. Also good for the sport car & 1M.
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Kevin
Dravit Gray, Black Leather, Moonlight Roof, Red Calipers
2022 M4C - 2020 Z4 M40i - 2023 FORD Expedition XLT Max 4X4 400BHP - 2009 V-Star - 1998 Ranger 4X4 5MT - 1965 Cobra (R) 5MT - 2023 Jeep Wrangler Sport S 6MT |