the car is throwing a code, you should find out what code by reading it
it does sound like a pretty serious code if it limits RPM
note that on my stage 2 custom tune the redline was upped form 6500 to 6800 RPM, note that the trans is limited to 7000 rpm, if I put it in manual mode and just floored it to reline without shifting, it would overshoot to 7000 RPM, at that point the trans would disconnect with a loud CLUNK and it would put car into N, and throw a transmission over-speed error code, most likely if the redline was set a little lower like 6700 that would not happen
note you may want to also consider bootmod3 stage 2 flash, that is very stable, I tried that as well, it runs more timing and less boost and also does not change the redline, and you can read the codes and try different flash your self
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