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I think the rule of thumb is $50 ~ $75 / hp
I think the max you can reach with "all tricks" is maybe an additional 50 hp = $3 ~ $4k
After that it gets real expensive with either an engine transplant > $15k or a turbo, also > $15k, so at this point it really might be cheaper to get a different car....
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I still wave at Boxsters, but they no longer wave back :-(
2002 Boxster S "Violet" (sold but not forgotten)
2009 Carrera 4S "Kelsey" (current ride)
2015 FIAT 500e "Nikki" my commuter car
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