Quote Originally Posted by anyonebutme View Post
let me clarify: stock boost gauge is basically a MAS airflow gauge. When you blow off a post turbo pipe, the turbos are free to just blow air right out, greatly increasing the airflow the sensor reads, making it show max boost while just trying to idle. If it were a preturbo pipe, the gauge would read low or not at all.

as far as I care, the stock gauge is only good for telling you which side of the turbo the pipe came off, lol.