Quote:
Originally Posted by Clamps89
I had the JB4 on my N54 335i and loved it. I don't know exactly what harness I need and if I need the USB cable. I didn't buy it with my N54 I don't think. I know the N55 won't compare to the N54, but I want to make it as quick as possible without spending serious $$. So JB4 Stage 2 and air intake possibly?
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I think JB4 Stage 2 with a downpipe.
Check the pic, if you have the same harness beside the airbox, you got harness B. If not, then it is A.