Mike - doesn't the N20 have just one turbo and one downpipe like the N55?
OP - if you're coming out of an E9x M3, why didn't you go for the M235i with its 6-cylinders and 300+ hp? Nothing wrong with the 228i/N20, but if you're looking for 300 hp, you wouldn't need any mods on the N55.
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2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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