as far as i know, you cant add both SC and turbo. back to the topic:
true if you wanted a turbo you should of purchased a WRX, the 2.5L engines arent teh greatest for turbos. me im going to NA my car, then when i smoke someone in a WRX, they can see my sticker "all motor". also if you couldnt afford a WRX and want to turbo your 2.5RS, you werent thinking right.