« Reply #2 on: 06 December 2021, 16:25 »
Biggest waste of money since dangly bits of rubber attached to rear bumpers were invented.
My parents had one once and I still decorated the back of my mum’s hair with recycled Sunday roast quite regularly.
Add a tuning box to a GTD and you’ll have something to smile about.
Add an oily filter and all you’ve got is an excuse by VW to wag a finger at you about warranties.
Seriously they do nothing unless you have a lot of other tuning going on. Diesels suck a lot of air so just cleaning your air box out once in a while and banging anything loose from your paper filter will keep it running just fine.

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‘23 8R, ‘20 8CS, ‘19 135iX, ‘19 TCR, ‘17 Ed40, ‘17 GTD, ‘15 7R, ‘13 GTI PP, ‘11 GTI, ‘09 GTI, ‘98 Ibiza Cupra, ‘05 GTI, ‘06 Polo GTI, ‘04 GT TDI, ‘05 Fabia vRS, ‘02 GTI T, ‘03 Ibiza TDI 130, ‘01 Leon 180, ‘89 mk2 16v, ‘99 Ibiza TDI, ‘96 VR6, ‘98 Ibiza TDI, ‘92 VR6, ‘88 mk2 8v, ‘92 Polo G40, ‘91 mk2 8v, ‘89 mk2 8v, 205 GTI 1.9, ‘83 mk1 GTI, ‘80 Scirocco GTI, plus some others I’ve forgotten