Originally Posted by PeterM
Boost will not matter that much its how much power it makes at that boost. Back to my 1.8T days i ran 24psi on stock turbo and 24psi on upgraded GT35R turbo the power difference is nigh and day and i ran the risk of blowing the motor. So are you saying increasing the boost by 4-5psi on a stock turbo N55 motor it will blow? Aren't the N54 guys pushing close to 500hp on stock engines.
Unfortunately the differences between the n54 and the n55 are way more than just a different turbo set up and valvetronic. The n55 swapped out some internals to save some weight.