like you said, heads, cam, bolt-ons. Thats the most common way of making good power but its not cheap since you need other parts to go along with it. Theres the option of power adders such as nitrous, or forced induction. I would start out with some headers, and gears and a tune. That plus what you already have would easily get your car into the 12's and dyno around 350rwhp.
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Twisted Minds Racing
2000 SS M6
9.71 @ 142
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