I have found a cheep alternative to upgrading your rear brake calipers.
Since installing the heat resistant, polyvinyl chloride (pvc), self adhesive stickers I have found the rear braking to be far more stable and balanced. I am very pleased with the font size and colour and particularly impressed with the arrangement of the letters and the weight increase seems to have had no effect on handling.
A word of caution try to match the front or you will look a right tit.
Sorry John, this should have been in the new products section