CSL ECU? So I'm assuming you're running a CSL air box. Sounds like the transmission is downshifting without blipping the throttle. Right? So do you feel the same thing, but worse, when you down shift without braking?
I'm moving this to the Coding and Tuning section.
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[Track] 03 AW/CIN 6MT E46 M3
[Street] 08 AW/FR 6MT E92 M3
[Tow/Overland] 23 Toyota Tundra HV TRD Off-Road
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