So far on Thursday evenings David and I have my roadster and his coupe. As best I can tell David is a better driver than me, but the racing is close with 4.0′ s and some sub 4’s. We have practiced in real drastically different track conditions. I have broken the 4.0 second barrier, but not as often as David. David has not expressed faults on my car recently so it must be getting close. I am not having guide problems with the stock guide. We have changed our front wheels to aluminum and I think Zero grips, but I think the Goodyear fronts may be ok. I only have the tiniest ballast (little finger nail size) near the guide.