Yeah it all depends on what you want to do with the car. Bang for the buck and reliability/ease, I'd say If you're after max peak HP and maybe some drag racing do the GTM TT kit. How much power is really down to how much wallet, and 600 should be possible without going way too far. If you're doing a road-race car where you expect to sustain high RPMs for long periods, maybe do the GTM SC kit and tune it conservatively (larger pulley, etc) to keep it reliable at ~400-450rwhp.
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