This is what I used on my CSS. Huge improvement from stock. Not sure how it compares to Ben's, but this was up there on the best $300 I've spent.
FUNCTION-FIRST > Shift-Right Solution
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
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