sorry dude dont be a prick about it when westcoaststyle was trying to help...even as little as i know about boost as soon as i saw the original post i could have told you that it was the wastegate srping and been 90% sure...if you have a sping thats rated for 10psi then you SHOULDNT be able to make 15 psi unless you have a srping that is made for 15psi or more

PS not trying to be a prick either but dont ask a question and later say i knew what it was i just wanted to see what yall think...if you KNOW for sure you wont ask...at least in the form of a question...especially when some of the stuff you said makes you look dumb