So I have had the tdi tuning box for few months now and I finally decided to go Remap route with @bobby singh and booked with him for the 15th. I have allready covered well over 15k miles with the box. At max setting 7, you definitely feel the extra torque but overall a bit tame compare to even some generic maps (Celtic Tuning) that I had on my previous cars which is to be honest expected with tuning boxes in general. At max setting, there is definitely over fuelling issue as the dpf regen happens more often. There is also quite a bit drop on mpg with the tuning box even though on the dashboard it shows the opposite averaging 55-60mpg doing 70mph when in reality I'm getting around 44mpg Sweet spot seems to be setting 4 or 5. I never got the car dynoed with the tuning box on so I can't really comment on power gains. Would I recommend it to others? Hmm well yes and no honestly the reason I went for tuning box in the first place was for warranty reasons and so if you are also planning to keep your warranty, its one way of gaining little bit more power but I still recommend proper remap ideally a custom one. If anyone is interested, I'm planning to sell my crdt4 box used on 65 plate 2015 A6 Avant bitdi. It was purchased directly from tdituning on end of april and had it fitted at their headquarters Chelmsford. If I can be bothered, I'm going to try to get the car dynoed probably at Surrey RR after getting remap done with Bobby to see the results. Expected figures depending on the cars health is around 400bhp and between 820-850nm torque. I honestly can't wait to drive a car with 400bhp as the current power with tuningbox is the most I have experienced driving though have been a passenger in a 6.2 c63 amg estate for a 10 min journey. I have to say I do feel the gearbox software mapping on these cars are a bit disappointing. Nearly half the time I feel the car is somehow on the wrong gear. I wish there was a way we can tune/remap the ZF 8HP boxes. Also is there trusted gearbox specialist then can do a proper full gearbox service on these boxes ideally around North or East London area though I am willing to travel. The cars mileage currently at 55k miles and from what have found online, recommended gearbox service is at every 60k miles? I average 40-50k miles a year and planning to keep the car for at least 5 years. Thanks for reading.