[Bigtop]

Has anyone done any before and after dyno/performance testing specifically on the F15 50i with the BMS N63tu piggyback tune? With an F15 that has not had any header/exhaust etc. mods, just a standard F15 50i?

I have seen test results on 5 series and other N63tu cars that have had other mods but nothing on a bog standard F15 50i.