So I just drove my LS swapped EJ2 with rear disc conversion for the first time today and I wanted to share my experience. My braking setup is: Front - Baer Decela drilled/slotted rotors, ceramic pads Rear - DC2 disc conversion, factory rotors, ceramic pads Fluid delivery - EX 15/16 master cylinder w/ factory 40/30 proportioning valve I have left the factory prop valve in because it is such a slut to change with the intake manifold in so, I'm going to change it when I get a Skunk2 IM, or whatever. So, with the 40/30 prop valve, the pedal is very hard, and the car has more than adequate stopping power. People say that you MUST change the prop valve but, I don't feel like it is a necessity. I think the 15/16 master helps quite a bit. We will see how it is with the 40/40. I will update when I actually change it. Just wanted to share. It is definitely worth doing the rear disc conversion.