Quote:
Originally Posted by Eurohorses
I had JB4 on my M6 and ran into issues almost weekly. Replaced plugs and packs twice in 6 months... limp mode issues. It wasn't for me. I sold it and the car ran perfect again. Ended up selling for the M5 but i'm steering away the JB4 this time around.
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If there is an issue with the cars hardware running higher boost levels will expose those issues. That said the F10 M5 is a completely different system with pneumatic wastegate control, nothing like the F90 M5 with it's electronic wastegate control. I've never heard of a misfire issue with the F90 or even a failed plug or coil. And the boost control with EWG is much better with or without a JB4.