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Anyone get this figured out?
I have a M8 GC Comp which is basically the same as the M5 F90 and I'm having the same issue.
Car drops boost at high RPM's. Logged it with an Autel scan tool and sure enough it goes from 20psi to 14-15 psi at high RPM. More noticeable on 4th and 5th gear. 5th gear does not go a pound over 16psi the entire pull.
I got new Dinan Coil Packs, NGK plugs, Re-fueled elsewhere with 93, have tried 3 gallons of E85 for E20 mix and still no luck with the car dropping boost.
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