Tyres is a funny one really, when I first got my ST170 I had 4 lovely Toyo PX4's fitted. The reason being is on a previous car I had some Toyo t1r's fitted, and although a lovely tyre, I thought the sidewalls were a little soft, but again a brilliant tyre. The PX4's I found a little firmer on the sidewalls, which is a personal preference I guess at the moment I have some Goodyear f1 asymmetric 3's, which work really well, but if the budget allows I'm thinking of a set of lovely summer tyres on a second set of alloys.

Good luck with the resistors, as I did spend a little while looking on Google for some results but couldn't find anything for you. After work tonight I will spend some time looking through some of the American SVT forums