Today I bought replacement Filters from my Local Car Parts Dealer (Camberley Auto Factors).

I had previously visited the Mann-Filter website to get the numbers for the Cayman S

Oil Filter HU 719/5x £13.95
Fuel Filter WK 832/1 £26.95
Cabin Filter CUK 3360 £21.50 (This is the upgraded Activated Carbon Filter)

All prices include VAT

I believe these prices to be better than from Porsche - they are the same parts just in OEM boxes............

Hope this info helps.

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Cheers Karel

'Power is Nothing without Control..........'