Im building my B5 for track only & so won't be using my factory ECU. My car was dyno tuned at Authority in VA in 04 with their stage 2 tune ( +66hp - +77ftlb). Only requirements are that you're swapping it with another ME7.5ch & that you have an air box eliminator+exhaust. I ran this tune w/upgrade N75 & diverter valve for 5years w/excellent results. Reasonable offers only. Please call bc I don't make it to the forums much these days. 2038309689.