can anyone tell me where the vacuum pipe goes coming off of the dump valve? i'm guessing this goes to inlet manifold??? do i need to get a new t piece??

What are you trying to do?
Are you fitting a dump to air valve instead of the recirculating one?

In that case plug the whole left on the intake to the turbo, and fit the new one as the current one is fitted.

ive fitted the dump valve to my boost pipe and it works fine. it has a valve on the end of the dump valve though and was just wondering where to connect this to

there should be a small 3/4mm pipe that leads back to the inlet manifold