If it sounds like "Ewwwwwwww!", then the starter bendix drive is not disengaging -- my car did same. Squirt some lithium grease in there.
If it sounds like"thwacka thawacka thwacka", it's a cam chain pretensioner spring that's not strong enough -- replace with new spring or live with it -- only an issue when starting and oil pressure is zero.
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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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