I recently upgraded my ECU and putting out 270 hp to the wheels but clutch is slipping. What clutch do you recommend for over 300hp?

 

2007 Mini Cooper S black. Has JCW side skirts, front and rear aerodynamic kits, new rims and tires, JCW turbo, coil overs, upgraded intercooler, JCW brembo front brakes, 3inch exhaust with downpipe, upgraded stereo system. 270hp to wheels. $12k.