It can be done and has been done with comparable horsepower
here is a thread from awhile back on the topic
http://www.perth-wrx.com/vb/mechanicals/6444-can-you-install-lpg-system-ej20s.html
also some info on rexnet and other forums if you are really serious about it and want to search a bit

http://www.scoobypedia.co.uk/index.p.../LpgConversion

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