1. Big wing sump is a MUST for serious track-days!!!

2. Best to keep the ABS on for now - you can allways remove it later.

3. Fit 3.9 diff/step-off.......Ideal for Castle Coombe on 17's/18's.

4. I would fit 17's as it will help with the gearing, and tyres are a bit cheaper than 18's.