As I am now selling my A3 tomorrow, the DTUK tuning box I was running on it will be for sale as it won't transfer to the new car (old car diesel, new petrol). This is the CRD-T box for the 184ps diesel engine, with loom fittings into the common rail and boost sensors, this was for a manual non-Quattro car. https://www.diesel-performance.co.u...rom-2012-onwards/2-0-tdi-184ps135kw-1968-ccm/ It certainly makes an improvement on the performance of the car, minimal/no lag on the accelerator pedal, excellent mid range performance. I have used this for 3 years with the car with no issues, just removing it for warranty work. I was still achieving 45-50mpg (calculated brim to brim) in general motoring, so doesn't knock MPG too hard. Bought from new for £350; selling for £190 + P&P.