It's not terribly bad. It would be even better with a smaller exhaust housing. I street drive it. I just ease into the the throttle to keep from smoking like crazy and once it starts to build a little boost it lights pretty quick
I'm not sure what it's based off of. Looks like a s400 style frame but I'm not sure. I can't remember what size turbine it has. Il have to measure the flange but I believe it's the same as my s400