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Exhaust mods
I doubt very much the claim of 20 hp plus. Neil from Orton Motors who specializes in doing performance mods for 986's mentioned that changing the headers from the more restrictive factory model will result in a freer reving engine. He did not mention anything regarding hp additional for doing the mod.
He does do the engine swaps which new engine costs are prohibitive. 16K for the 3.4L and 18K for the 3.8L
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