I have never had any problem w/ the service techs at fast, contrary, it`s been among the best I`ve dealt with! They are busy, but have called me back when I couldn`t get ahold of them. I`m no wiring expert by any means, but their directions and a "little" common sense worked for me. I only have about 350 miles on my fast 2.0, but it has already smoothed out and running fine. I have changed the fuel ratio, and timing some tho. Pricy, but comes w/ everything, no need to go order other parts, or scrape up fuel pumps , or somebody elses regulators and such ! Very nice to tune, in the drivers seat ! Have heard that a lot of systems need about 500 miles on them to clean up .