I would skip the polybronze stuff until you decide you want a more DE / AX oriented car. Otherwise I would only change the rear Bilstein's to Street and move to 26mm torsion bars. My previous SC had that setup (recommended by TRE and done by them) and it was a delight to drive.
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'06 Cayman S
'16 Cayenne
'08 Audi RS 4
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