spooled-r

okay so i had to replace the gasket between my turbo and the manifold and that is all i did but ever since when i hit boost it only goes to ten pounds and then stops and wont go higher then ten pounds i use a manuel boost controller and it was hitting 15 pounds no problem before. there are no leaks in my piping and bov seems to be fine. Have any of you had a issue like this just wanna be sure its my wastegate before i buy a new one