Ive got access to a cheap set of Wilwood 4-Pot rear calipers, i havent had a chance to check out the mounting points though.....has anyone used these on the coop before?

Will they work with the pull cable type handbrake ? Be very careful with an over powerful rear brake setup, you'll be doing donunts every time you press that middle pedal.

Not sure about the compatibility with the coop's handbrake....ive yet to look to much into it.

I was also thinking similar lines to whether powerful rears would overwhelm the braking balance of the car...but with the huge difference in disk size im thinking a 4 piston front and rear combo would still be useable...

So long as the compensator is set up to deal with the extra effort from the rear then it should be ok, I run the 300mm rear disk conversion and that works well without any rear locking up issues, in fact the handbrake is now superb.