Raybestos makes excellent aftermarket brake parts. When I installed 4 wheel disc set ups on my 46 and 55 Fords, that's what I used. Sure the drilled/slotted looks cool and I certainly wouldnt discount trying them. Its a given that the factory rotors suck monkey testicles. I wouldnt replace w/factory.

Rear disc brake conversion
 

Okay, what am I missing here? Rock auto lists the following parts:
2 hoses $ 40
rear brake hardware kit $ 10
Raybestos 2 calipers w/ceramic pads reman. $320
Raybestos 2 rotors $182
2 hubs $302
2 wheel bearings $324
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Total Parts $1178+ shipping

I just can't see where labor could be more than $300 at
a good independent shop. So for around $1500 give or take
4 wheel disc brakes. Incidentally, all the parts I looked up were spec'd
for a 2008-09 HHR SS. A lot of common fit for Malibu and Cobalt SS.
Seeing as many people put $1500 into their sound systems I find this to be
economically feasible. I myself am looking at spending $1200 for an in-dash
nav system.

This sounds interesting and simple.
Does anyone know if the e-brake interfaces with the disc upfit the same way as the old drums? I'm asking this for my son's benefit, who has an '09 Cobalt LT with rear drums.

I read somewhere on this forum that you would need the SS rearend. The LT doesn't have a place to mount the calipers.

The flange where the hub and caliper mount is different on the SS axle beam than the LS/LT beam.There's nowhere for the caliper to mount on the non SS beam.

So what you're saying is in addition to the parts I listed, one would have to buy a rear
axle. Part # & cost?

Can have brackets welded on if your energetic....

Any modulation issues or is the pressure the same?

MC and or proportioning valve required as discs require alot more fluid to operate...would really mess with the anti lock system....ummm, and maybe not.depends if pressure monitoring is involved..