[idheaton]

Originally Posted by PlayersExpress

I don't think the 3.4L swap would be the only way. It's a little expensive.


Tell the guys with the Nissan Skylines with a RB26DETT 2.6L I6 that kick out OVER 600HP to swap out their engines for larger ones.
http://en.wikipedia.org/wiki/Nissan_RB_engine#RB26DETT

So I think it is possible to get a 2.5L DOHC engine over 300hp... correct me if I'm wrong.

http://www.roocksport.com/main/tuning_boxster.php

Roock advertises 300 - 500hp but it's not from modifying a 2.5. These are based on engine conversions(swaps).... a basic 3.4 conversion gets you around 300 and if you want more hp then you are looking at turbo-charging and/or doing a 3.6/3.8 conversion.

I'm not entirely sure but I would bet that to get 500 hp out of a boxster you are looking at a twin-turbo'd 3.8 conversion.