If you like to go fast, I'd look for a 3.6.... That will swap into your '03 pretty easy.
I went down that road myself (bought a built 3.8 converted 3.6) but wound up buying a newer car and reselling the monster motor instead of swapping my 2000 model car (not an easy swap).
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"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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