I have had this Imagine Injection on my car since 2007 and have liked it very much. The original ecu on it was a FAST XFI and when tuned correctly worked fine. My problem was that I never learned to tune it my self and good tuners are hard to find. Lots will tell you that they can tune FI but not many can really tune the multi port stack systems. One tuner totally f'd my ecu in 2010 and I switched over to the FAST EZ system. It is self tuning and has given me what I call a 90% solution. If I were racing I probably would want a more tunable ecu to have an edge on the competition. For the rest of my driving use this system has been great. I would highly recommend it.