Almost positive the n55 is not capable of running against a s55 without a turbo upgrade. I'm FBO with BM3 tune and got absolutely walked from a roll against a stock m4. I'm pushing 370/420 to the wheels and got rekt 3 times consecutively. The longer the race, the bigger the difference. The s55 is on another level. You might be able to keep pace for a while if you have awd and the m4 can't catch grip.
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