It is indeed only 10--on a stock computer don't mess with the overboost switch under the hood as it'll prevent you from exceeding safe boost. Yes you'll get annoyed, but that'll inspire you to get a Rocketchip faster.
With the bigger exhaust, don't forget that you will likely run into boost spiking issues unless you port the waste gate on the turbo. The stock hole is small and can't flow pressure fast enough once you start opening things up.