if you wanted a faster car, should have went with the 335i. less weight... huge mod right there!
so now, since you got the XI, get a FMIC, and a meth kit. should be 400-415hp
JB4/VRSF DP/BMS DCI/ONEIGHTY FULL LED AE W. BLACKOUT/ BBS LM DBK/ M3 SIDES/ OEM M-TECH FRONT & REAR/LCI TAILS/ PERFORMANCE SPOILER/BLACK ROOF/KENWOOD TOUCH-SCREEN NAV/ALPINE/H&R SPORT