hi there,just read this thread, loving it.I used to have an 09 fester ZS and loved it, like a go kart but not enough power. Now got a 13 plate focus ST, its got a cracking engine,little or no lag,almost like a supercharged motor.With the TC off it wil easily spin the wheels into third gear.Combining the two should make for the fiesta Ford should have made.The focus has plenty of torque steer but your diff should tame that.Looking forward to seeing your project complete