If you end up over heating your rear brakes in IT, something else is seriously wrong. Focus your energy on the front brakes. I'm "assuming" it's a rear wheel drive? All the front wheel drive cars I've raced I've put the cheapest pads in the back because they really dont do much. Rear wheel (i.e. Miata, RX7, BMW) are a little better balanced but still............ over heating shouldnt be a concern......