« Reply #23 on: 10 May 2013, 13:41 »
No, aren't the the exhausts on the cab R at either side but tail pipes are different shape so maybe not fit a gti?? 
Yes they're oval, possibly sharing the Scirocco R rear exhaust box (feeling like a real anorak now!!!) but the cutouts look similar to the standard diffuser from photos.
And unless you live in a small area of London, part of Essex or maybe Poole I doubt you'll see enough R Cabs to get to check properly!!

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‘25 8.5R, ‘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