Quote:
Originally Posted by grassy_91
Honestly you don’t need a new turbo man. If you just want 400 whp stick with a tune, downpipe, and intercooler. Don’t forget chargepipe too. It also depends on your budget but if you don’t need crazy power don’t get a new or upgraded turbo. I never had an intake on my car and everything was fine. Don’t forget to set jb4 to map 5 and get the EWG harness
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You can’t reach 400 horsepower without sacrificing smog-legal with N55, BMS claims 355 wheel horsepower with intake and full exhaust. An intercooler and catted downpipe may only add 30 max horspower. The next step would be to either switch your fuel system to run E85 and get a tune that is still smog legal (good luck with that) or upgrade your compressor/inlet on your turbo with either a Pure Stage 1 or Dinan Big Turbo.
Dyno Maps are down the page:
http://www.burgertuning.com/N55_JB4_...BMW_tuner.html