doesn't stock mean how it came from the factory? when something is not stock then it is like an sftermarket modification. so a TTZ would be stock as long as it is the same as when originally bought. this is my belief. I have a 2+2, and people ask if its a turbo, I say no, and they say "oh its stock". I dont know that just pisses me off, or maybe Im wrong, but I still get mad. Sorry had to vent