let me put it this way, a rebuilt stock ka would be good for low psi turbo (under 8psi). but remember, your set up will only be as reliable as the amount you put into it. i personally have never seen a stock ka turbo last more than about a year on low boost. the more boost you run the sooner it will blow. and they do all blow eventually. save a little more money and so a stock sr that will last forever. my .02