Heinz
Are you running Avon's or AO40 Yoko's? if Avon's then try 4 front and 4 rear its all about what you feel happy with if you are running Yoko's for the road get rid of them and go back to Avon's.
Peter the factory car may well have been running on Avon's at the time of being tested I have driven the factory car when on Avons and Yoko's but the biggest difference between the Std SS and the factory SS is the 4.1 diff it's a massive advantage!!
Regards
Racer
