Have done quite a few trips now, in Various M cars and all I would say is , take it at your own pace , get a few cool slower laps in first and dont get too tied into chasing someone who has just screamed passed you, even if they are in a MK1 golf 1.6 !
Chances are they do it all the time and know it like the back of there hand.
I dont think the traction hinders the car too much , so unless its all about saying I can do it without the traction , it wont make any difference to your times or experience, unless your a seasoned pro... its NOT like a normal UK track or most tracks, its really a fast road.. and a bloody awesome one at that.
Lot of idiots out there too + bikes so eyes in the back of your head as like day to day...