don't go too fast and then have to scrub that speed off a bunch of times each lap. Note that they WILL fade and go 'green' on you, but they will be better by getting to that point AFTER (and ONLY after) a good hour or so of cooling! They CAN be scary in street use in cold weather if you don't KEEP some heat in them which is why I won't use them any more. I use HPS for street and either Blues of HT10's for track. Hawk makes some nice products. I've used them for over 10 years. HTH Good luck!
KEEP THE LEFT LANE CLEAR FOR FASTER MOVING TRAFFIC!!!