if you want big power just get a bigboost turbo kit and a upgraded hpfp...there lot of n55 guys doing 600whp+ with it
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Current Ride=2008 BMW 335xi
2017 BMW M240 Xdrive
2017 BMW M2 N55 6spd
2018 Infiniti Q60 Redsport AWD
2008 BMW 335ix
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