The same problem (warping of one disc due to "asymmetric" directional vanes on both discs) is present on the Brembo brakes of Performance Pack of the Leon Cupra, several reports on SEAT forums. Sounds almost incredible to have something so obvious leave the design office of Audi, SEAT, and now VW... It's so basic that you gotta wonder about couple of things...
On another note, just one track event and discs got warped? I'm smelling too much enthusiasm ("gotta live up to the Nurburgring record story" and all... ) Oh and £1300 for CSS brakes and pads seriously? Those 4 items shouldn't be costing more than 500 eur altogether iirc so I guess there's a pretty big (inflated) labour cost included in that quote.
2 track days with the CS so far, one of them on a really small, tight and quite brutal track for brakes without any issues...
PS. I'll second what was mentioned earlier in this thread though that you shouldn't(mustn't) need ducts for road use or you must be doing something really (like really really) wrong. Having them on for extra piece of mind if doing regular track days or just for showing off to friends in the pub is fine but anyone actually claiming he suffered brake fade, with the PP brakes, on a public road, unless doing repeated 100-0km/h tests OR driving down a very steep empty hill, needs to have his licence revoked...
Couple of points the article in VW Driver mag I think the owner is a writer for the mag as refered to previous "instalments". Also the race track was Bedford, & it was £1320 for All new discs & pads inc fitting front & rear...
VAG like many manufactures will do things down to the cheapest price, it is cheaper to use the same blank....why they did not use radial (non directional) vanes I have no idea..
Also of note:- the side which has the wrong rotation is the side that the FXD "Haldex unit" is on..
Final point, you can cook most brakes at legal speeds in UK & driving sensibly, you just need the right roads...& I live near the best UK drivers roads & one is about 2hrs end to end .....& has three steep descents/ascents....very easy to cook brakes & with mates & ski gear in even easier...
I have the light 1.4lt so way less nose weight than GTI & R...& the standard 288mm discs I cooked & have total loss of braking after the last descent of the drive....upgraded to 312mm ATE discs & pads & Audi TT cooling ducts & no problems...however if I had the 340mm setup on a GTI/R with the heavier engine I think I could still cook that set up....at least the piston seals...
The 340mm set up with a big cast iron sliding fist caliper & one piston is a joke....a 312mm 4 pot brembo is way better at heat disipation & braking & way lighter (reduced unsprung weight)...& the Seat Cupra R used to have this fiited years ago & it was an easy aftermarket upgrade for the Skoda Fabia VRS..
VW just upselling rubbish to get the most profit...