to my TDI 75 at the weekend. Fiddly to get a '+' connection otherwise easy fit ( have used it before on a TDI 130 A6). First impressions are much smoother and pulls better above 2000rpm, economy no worse (possibly better) still playing with settings but mildly disapointed with performance uplift, had hoped for/expected more. Thinking of getting Koni FSD and greenstuff brake upgrade at Awesome so might ask them to put it on the RR and see what it shows.