Before I was running e85 and ISO update, map 2 with my mods felt fast but not that fast. I went to map 7 with 103 octane race gas 50/50 mix and the car was night and day. After ISO and e85, forget about it, my lowly single turbo screams like a beast. And to the poster above, yes 335is still using n54 engine with twin turbos.
2011 e90 KW V1, JB4, BMS Dp, BMS Intake, CP, Alpina Flash, ISO, E85
Coming soon to the garage: 2014 M3 Maybe M5