Junior Member, warming up (<31 posts)
Join Date: Sep 2018
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Had a similar issue with my Hartge back boxes in that they 'resonated' between 2,000 - 2,400 rpm in 7th (110 - 119 kph). I even drove around the drone zone to avoid it (shifting down or up to avoid the drone rpm band). Eventually I put the OEM's back on so I could listen to the Eventuri's growl.
10k? ouch. Presume you installed BE shells, ARP bolts, did the HP internal Vanos line, engine mounts and actuators for that sort of money. Rebuilding the actuators is not a guaranteed fix by the way. The PCB can be cooked and look and work ok, for a while........
E60 M5. Silverblue.