ok, i have a 2012 ve ss (povity pack) that i have already upgraded the front brakes to 355mm 4 spot brembos (redline G8) and they work fine. I have the opportunity to upgrade the rear to hsv ap 4 spot 2nd hand. so is there any problem with mixing the two different makes of calipers? will there be a need to change anything other than the calipers, rotors, bolts and maybe rear brake lines? i have read i need to trim the rear dust covers. my real concern is will i have any issues with abs/esp or brake bias?