Azainr, his attempt was via the use of an o2 modifier, not an air/fuel controller. From what I was told by Split Second he used the modifier to atttempt to trick the ecu into thinking it was running richer than it really was, much like the clamps floating around. We took the approach of building and actual air/fuel controller that would interpret and modify the actual maf, etc signals to the ecu...ok now on tuning questions. The unit will come preset with a map for one of the indicated test levels. This map will work fine right out of the box and for most users will never need to be modified. Thats whats great about this unit, its preset for the basic users, but via the R4 software allows tuners to custom tune it to their exact setup. Whether it be upgrade injectors, a fmic or smic, upped boost, exhaust, the unit can handle it all. As far as advanced tuning I would recommend you do this on a dyno to obtain the best results, though the use of a wide band and datalogging would also work well. As we get more and more tuning time, and hopefully a diverse group of locals, we'll be able to offer more maps, like i said earlier we plan to release another 3-5 maps by xmas that will include mods such as turbo back exhausts, FMIC, ported intake manifolds, and other such mods. THe best thing is, you dont have to sent it back to us! We send you the info you plug it into your laptop, hehe or home comp if you have a reallly really long cable, and make the changes. For those of you wanting to run over 12psi....though I will help you with settings and tuning, based on my 5+ years experience with the FS series engines and tuning I would not recommend it if you'd like this motor to stay intact for a significant length of time. This unit is designed to enhance performance, not bullet proof your engine. N/A guys YES this unit will work for you also. whether you plan on staying n/a or adding a turbo setup this unit will allow you the fuel control you need. Whew ok now for the good news, we will be offering a one time only GB price of $285 + s/h that will apply ONLY to the first 10 people and will ONLY be effective if we do indeed have 10 people to fill the order, which doesnt appear to be a problem. Regular price will be set at $325 unless I somehow manage to obtain the xmas spirit and offer a second GB. PLEASE DO NOT PM OR EMAIL ME THAT YOU WANT ON THE LIST. I will start a GB post in the MSP vendor section here in a few days and yes I will put a post on here to let you know when the thread is up.