Greetings Percymon,

I agree entirely re wheel sizing. Daughter in law has a Golf GT 170 56 plate with 17" rims - same problem. She also has a major problem with the DPF choking, a common thing on the170 apparently. Son had a Scirocco with 18" - again noisy back end (car not son!).

My new purchase has 16" rims shod with 205/55/16 Pirelli P7's and of course at this point in time is wonderfully quiet!

2012 Jetta SE TDi140 (now remapped to 170), Pearlescent Black, F&R sensors, RNS510.