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This may be a dumb question, but did you check your belt? I remember my 03 Cobra losing boost because the belt kept slipping...installed a tensioner and problem solved.
EDIT: Bah, nevermind, just re-read your original post where you already checked this...reading comprehension is obvioulsy not one of my strong points.
Good luck with this, I know what a PITA trouble shooting something like this can be. I must have spent about 2 weeks trying to figure out why I wasn't making the right amount of boost when I upgraded my Cobra to a turbo setup...damn frustrating, you just want the damn thing to work.
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2011 Le Mans Blue M3// Black extended Novillo w/ Blue Grey Aluminum trim/DCT/ZTP/ZCW/ZPP/ZCP Premium Sound ///Akrapovic Evolution Exhaust
2015 Audi S4 Prestige, Brilliant Black S-tronic
2012 Le Mans Blue 135i M Pkg DCT
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