My opinion, I don't use any self learning system on a car that is going to be raced. The intension for this system was for a guy who had a carb in a street car that is a driver who wanted EFI and didn't want to learn how to tune. The self learning feature in a drag race application will just change the fuel every pass and the car will be inconsistent. Road racing maybe but the exhaust usually does not permit this. In a racing application the Sportsman XFI and XFI 2.0 fill this gap and can be programmed to work. Now, I will say the throttle body and hardware can be used with the Sportsman XFI or XFI 2.0 and be programmed to work. But I don't believe the self tuning in a race application is a good idea, I feel the same about an overly aggressive engine and self tuning also. You also can't run anything that will correct fuel closed loop or self learn with too short exhaust system, slip on collectors, open headers and any of the sort, the ecu needs good info to accomplish it's calcs. Header leaks, reversion from the exhaust being too short or anything that introduces air into the exhaust system will cause the O2 sensor to add fuel thinking it is lean, this is how EFI works. The old saying is garbage in garbage out, you can't expect ANY EFI system to know what is an exhaust leak and good exhaust. Any of the above potential exhaust issues will add fuel when the engine does not want it, if it is something you can program with a laptop, you can constrain the correction to what you want or what rpm it starts at and make some of that stuff work. Even when they came out with the EZ systems there was talk that anything below 10" of vac was not real good, I don't think that has changed. You can easily get the street driving mild mannered EFI you expect but the overall combo needs to be looked at, if you just slap on an EFI system you can't expect it to transform your angry big cammed lumpy engine into something that idles smooth. If you want an 800ci BBC that idles smooth and you can drive it around and make 1800hp you better be looking at ALL of the parts and not just what you are going to replace the carb with. Bottom line is the guy who is buying is 95% responsible to research the topic, if anyone here would have taken a basic class in EFI they would have known you can't run an engine in self learn speed density with a large cam. There are several books on EFI that cover this stuff and plenty of forums (mostly just as much bad info as good) and here at CPGNation. YES, you should be able to get good info from the Sales/Tech support guys but remember they are also not out in the field installing this stuff. Most guys would rather buy this stuff from Summit and Jegs to save $5 and then complain on how it does not work. Part of our whole business plan at my shop is great tech service. This goes to the point where I spend hrs of my time on the phone with people to get their stuff sorted out and working correctly. I work closely with the staff at FAST on a daily basis, I share potential issues and fixes we found in the field and I help some of the tech guys when they are not sure how to answer a question. If your new to EFI, then buy from a competent shop with a history of installing FAST products even if you have to pay a little more for their time and support you are way money ahead.