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I just browsed Jake Raby's site and he offers a 4.0L upgrade with 450HP...but not street legal, as stated. "Fits all Porsche Boxster and Boxster S models from 1997-2007." Pricing is expensive as you can imagine, but his reputation on this board and elsewhere seems to be solid, unlike Roock, as you mentioned. Good luck and I'm not associated with Jake Raby, just sharing the info.
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