Originally Posted by MikeR
That is the difference.... SLK32 has the 4 piston front and 2 piston rear....SRT6 has 2 piston front and 1 piston rear. Same rotor size. I am saving my nickels for a set of C32 AMG rotors and calipers.

Interesting...I always thought they were the same.
BTW, C32 calipers will bolt on but you have to swap the right and left calipers, which results in having the wrong leading/trailing pistons. Not a big deal, but it can lead to uneven rotor wear/warping and brake squeal.
If you don't have a problem with that minor issue, then you should also consider SLK55/CLK63 brakes. Bigger, lighter and way cooler.