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Keep the S4 keg, upgrade to S5 rotors. I dont see a real reason to use an RX-8 shaft unless you like spending money on something that could be chewed up (seen the insides of a blown renesis and old bearings....its not pretty).
Streetporting is a good idea, choose your apex seals wisely, oem is usually the best.
What header are you going to be using? Any NA with no cats is going to be loud, a header is louder, and no presilencer (like found at racingbeat) is going to be illegally loud and draw lots of attention from johnny law.
Though have you confirmed if this car is really blown? "Just shot off" is not really consistant with a blown motor. Blowing a motor feels like you just got half your power stolen from you and the engine shakes like a beast. Ive DD'd my own FC for a week on 1 rotor, started and ran every day on that one rotor until it was removed and replaced. Sounds more like a spark or fuel issue to me, though confirm its blown by pulling the plugs and just listening to the sounds coming from them. Wooshes indicate 'healthy' seals, while nothing at all means blown.
Good luck and hope my post helped.
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