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Yeah i don't think your tune is working. You are only getting about 420hp. Which is much much lower than the Dinan advertised 501hp.
Actually Stock 550i were dyno at 380 wheel hp. So you are pretty much stock.
You should get it check out.
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2011 535i Alpine White, Oyster on black interior, Premium 1 & 2 Package, Magnaflow Full Cat-Back Exhaust, JB4 Stage 2
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