BMW G80 M3 JB4 Tune Safe?!

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04-24-2024, 04:56 PM

DanG

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Quote:

Originally Posted by Captainkirk75

I was thinking of doing a JB4 93 tune to my car. Really don’t want to ship out my ECU and do all that. I don’t think il do ethanol either. 93 tune is good enough power for me. Is the JB4 a good option is it safe? Any cons?

Tune voids your engine warranty and probably your transmission warranty. Big con. Most people wait until their warranty expires.

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