Quote:
Originally Posted by Pete Schweaty
I am sure it causes extra strain on the drive train. You are adding about 100 extra HP. That being said, there are guys running 500 WHP with stock internals and transmissions. The N54 motor internals seem to be built like a rock. I am in the same boat as you, it is my DD, I dont track it. I have had a JB4 for over a year with no problems other than a misfire that was corrected by a plug change. There are also guys that have been tuned for 50 -70k miles with not real adverse effects.
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Sweet thanks, with 81k on the car i didnt want to be pushing it too hard and make the engine die quicker. Knowing that bmw builds a solid car already i thought it wouldnt have to many bad effects. Is a misfire common on the n54?
On another on, ive heard the 2007(the first year?) for the n54 335s had problems with the fuel pumps failing, are there any other known major problems? Seeing as it has 80k on it and all its maintanence is up to date. I would think its okay?