OK spoke to Steve @ SPC and he suggested the following for my 280bhp 2.3l Duratec revving to 7,500 - 8,000RPM and used 80% of the time on track:
- SPC 5 Speed Clubman box
- Semi Helical gears
- Quaife Alloy casing
What's the consensous, a good choice? Any more options I'd want?
R400 Duratec Build and Modification Pictures
here