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While it might be a good deal, and good parts I am wary of upgrading my car in such a way that my warranty is voided.. cracking open the rotor housing would definately do that.
There are cheaper mods that can be done and allow for an increase in horsepower as well. The real change would be for the rotors to get wider but that comes as a different engine, because you can't upgrade to wider rotors.. the housing won't accept it.
This is rather a bad upgrade to do, even if there is a horsepower increase (which I'd doubt if the rotors are the same size/shape, and only a weight difference). Best to stick with CAI, Exhaust, etc to get a bit more kick out of the car.
I think I'll be happy with the power, it's handling for me that I am concerned about and reading reviews lately it's something I don't think I'll have to be concerned about
I think there may still be some confusion between "MMC brake rotors" and "MMC Wankel engine rotors". As far as I know, there has never been an MMC Wankel engine rotor. There are lots of MMC brake rotors, including some installed on cars with rotary engines.
It sounds like the suggestion is to upgrade to MMC Wankel engine rotors. That would be expensive and time consuming, considering you would have to do all the development. It isn't really an option for the average owner. And at 8.5 pounds already, it is not clear that there would be much to gain over the stock rotors.
Racing Beat makes aluminum side and intermediate housings for the 13B. I doubt if they have any with side exhaust ports, however.