I've tracked with the stock brakes and the AP's. The worst part about the stock brakes was that they gave you little feedback that they were about to go away, the stock pads in particular were very easy to overheat so you don't want to use those on track. With a better pad like the XP12 you will get a lot better heat tolerance and you should be able to complete your sessions without problems, but the dust seals on the Akebono's are going to be toast.
With the AP kit I have been able to torture the brakes, but a high temp pad is a must if you really press them hard. I still come into the pits with smoke coming off the brakes more often than not, so brake cooling is going to be my next priority.
I say if you really do a lot of track than it is a worthwhile investment.
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