You mean a 6MT? AT doesn't have a clutch, it has a torque converter.
But yeah, an aftermarket clutch could allow a 6MT to handle more torque. But you'd only need to handle that much torque if you have big turbos or other heavy horsepower mods.
2008 135i Montego Blue sport pkg, premium pkg, Logic 7 sound, iDrive/Nav
Mods completed: JB4+ & FBO || LSD || BMW-P suspension + F/R sway bars || 18" Breyton GTS-R || M3 front bushings || Vogtland camber plates || BMW-P rotors + Stoptech pads |||| Acquired, not installed: BMS WW Meth kit || Logic HVI intake || Mishimoto OCC |||| Shopping for: Summer tires