Alright fella's, how much boost should I be seeing with my mods? Right I push around 10 PSI, then it shuts down. Is this normal?

Sounds normal to me due to the fact that you have a 4" exhuast, without the exhaust I would expect only 7-8psi before the boost fell off. I'm a little surprised your ECM is letting the boost get to 10 or is it just spiking to 10, how long does it stay there before it falls off?

It'll get up to 10 and sit there for about a second or two before it falls off. At that time while the boost is down and out, it'll shift. So it doesn't maintain it at all. I was also getting this before the exhaust.

You have to fool the ecm via MAP signal resistors or get an aftermarket prom/reflash to get higher.