Exhaust can surely get you there. I did LTH, HFC and exhaust, and took me from a 271hp baseline to an untuned 300whp. Just don't get fixated on a number and get upset if it isn't quite there. Dyno's from one manufacturer to another vary widely.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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