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      02-14-2013, 02:27 PM   #8
MLSavage
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Drives: 2010 135i AW 6MT
Join Date: Feb 2013
Location: Jacksonville, FL

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Quote:
Originally Posted by b1aze View Post
That assumption is fairly inaccurate. In stock form, the N54 has significantly more headroom in the motor in stock form than the N55 does for a few reasons, mainly the turbo configuration however. If you were to ever want to go for big power, the N54 will be much easier than the N55. A lot of companies are abandoning aftermarket turbo modifications and upgrades for the N55 because its a huge undertaking based on the twin-scroll design and difficult boost control.

Now, that doesn't mean there wont be aftermarket single-turbo setups, but the work and cost involved in that is much much more than just a relatively simple turbo swap, like the RB turbos are for the N54.
Ah, I see, that's why I'm asking you guys, the subject matter experts!
I will admit I knew the N54 would be much easier but I thought it had more to do with software than simply bolt on upgrades. The engine tuning is the aspect I have researched the least about this car.
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