There is NO BENEFIT FROM USING Rx8 rotors. I have contacted Mazda racing usa about these and they said that they switched the s5 rotors from their n/a FC race car with rx8 ones and it had ended up with less trq, and less horsepower.

If you bevel the rotors, you would have to bevel the counterweight. It is not a good idea at all to the cut the rotors.

Rotary7~You can have 200hp on an s4 6port with a streetport with no problems at all. But you HAVE to switch out the n/a ecu (or go carb'd which I prefer) but that is what makes breaking 200hp on a 6port nearly impossible. You need something that controls spark AND fuel or you WILL NOT break 200rwhp. What I have seen in my days, using the stock ecu with everything portmatched with a SP, safc, you will hit 190rwhp.