Cybmx: sprint has different sized pads (for example - much thicker). As sprint front BBK is braking bias-matched to stock rears, imho better to install same compound pads on all corners, - stock sized in rear, - this kit sized in front. You may use different compound pads in rear, but it will certainly change brake bias, so imho better not. As it's mostly front that does most of braking, rear pads need to be exchanged way less often. For fronts you'll really enjoy cheaper pad prices and thickness of chosen pad sizing that will let pads last longer.

Thanks guys. I have the sprint kit with a few set of AP c300 pads, where should I go to purchase the matching pads for the rears?

Unfortunately that compound is not available in a FRS/BRZ oem rear...

Would you be able to recommend me an alternative? Thanks a whole bunch.

Unfortunately I'm not aware of any compounds that are directly comparable to the C300 that could be used as an alternative in the rear.

The Carbotech RP2 is somewhat similar, but has a bit more bite.

@CSG Mike @JRitt do you guys find that the caliper grabs the rotors pretty hard on fresh pads? I've done one track day on a new set of ds1.11 and my alignment guy (who races) made a comment that my fronts might need a rebuild given how tight they were grabbing and that the piston seals might be cooked. I'm skeptical since I've only really done perhaps 6 track days on the brakes... Although they were tough to push in when swapping the new pads in

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It's unlikely but possible, depending on your operating conditions.

For the guys that drive the car year round and weekend warrior the car, I usually recommend servicing the calipers once a year.