Started out with a vgt-ss when truck went in for surgery. It was defective from the get go, but it was not an Elite product, but pretty much a clone, and I was handed my stocker which was just about shot, and it did not make it. At 10p.m. I called everywhere and Spatan could have me the turbo next day. I respected someone staying up on a Sunday night to build me a turbo in an emergency and felt that they deserved my bussiness, as the vendor who sold/installed the ss did not feel comfortable with replacing the ss as their supplier had changed hands and could not vouch for the quality of the replacement. I have posted about some issues with my mods, dropping or missing while coasting, idle hanging up untill completely stops, and rough idle(after about 1K after programming it idles). So I guess that 190s just operate like this, but I would of went another route had I known. Like I said There seems to be trouble with VXCF4HB and gonna try to get the FICM reprogrammed and pray that it helps.I have not had any surge except when towing, and it was heavy, and Matt had offered to live tune it at no cost on a trip down to my neck of the woods, but I was not available during the time frame. I pay DJ to tune my truck so hopefully he will get the surge tuned out of it and get it to idle in a realistic amount of time. If not Matt is real cool about stuff and I will just hook up with him(he is able to tune the ficm), DJ seems to think there is a fuel table missing from the SCT software for my code, as their canned tunes work o.k. with my strategy. As far as how it runs? Good God if I'm on it watch out, it rips and all that it has is a street tune. Unbelievable whistle. Not a whole lot of boost though, can regularly hit 32 and I have not been anywhere to max it out, but if anyone is curious i will find somewhere to check it. One last thing, the tech that installed the Spartan turbo swore it felt like it had a 100hp tune in it stock. Gotta get a few more mods and we can all play with it and see what it'll do.