A match made in heaven!!
I drove a A4 3.0 TDI (171kw) while doing one of my HSDC and believe me this is a monster!! Unbelievable torque, great handling and excellent fuel consumption. Even when I drove with the RS4 we had a few on track with us and i'll be honest, if your not in the right gear the diesel closes the gap very quickly!! So I think the A5 3.0 TDI would also be my choice over the S5 ... That's untill the RS5 arrives ....!!!
