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I have N54 manifold on N53. I just installed big bore TB from RiotRacing. I had to route gas tank ventilation to airbox because this TB doesn’t have connector for the vent hose. I didn’t go to dyno yet but according to Awron I have 276 PS. If you compare my lap time to other cars it’s not bad. I’m in second place (325i). Unfortunately I had to quit after first round because my engine wasn’t running on all cylinders. I thought I had some bad coils but after I switch the car off and on again it was running normally. I thing that the problem started when I hit the rev limiter. (I have new aluminum flywheel)
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