How much grip am I going to get on these? I do like to rag my car, just wondered if i'm going to end up in a ditch or not?

185,45 if your refering to a 15" rim..... or a 195 if arch space isent much of an issue

arch space is a major issue as its a mk3 down 60mm

i could get em rolled like, so is 175 a possibility?

You can put 165s on a 6.5in rim,but where are you going to get 165x45s from?

165x50x15s will go on,but they'll be quite a stretch and a bit impractical for you.

The sizes advised above are less scenesque,but more practical.

I've got 185s on a 6in rim,and thats fine for this MK2 generation chassis.