I'm going to get a bar fitted to my TDI 170 sport but am loathed to spend the amount quoted by VW (best part of a grand). Local fitters will put one on for around £250 using the industry wide standard bypass relay. VWsay use the proper harness insert and re programme the ecu. I'm not bothered about the reprogramme bit to be honest but would like to know if anyone has used the cheap option of a relay and had any problems with the cars electrics?