Well they are OK for street use, nothing better than Stock one as there working temp only up to 300degree.
Type Euro-X would be better, its work from 0-600degree, a bit expensive £250
I would recommend the Lockheed SA=50-550 degree ZR=50-850 degree
But i suggest to use the ZR is better DC5 for street and track!
group buy price
SA - £105
ZR - £125
Please see
http://www.itr-dc5.com/forum/viewtopic.php?t=1582
for brake disc and pad group buy.