I've had this issue since I've owned the car and just assumed it was a boost leak since the previous owner did a hack job with the intercooler piping. Well I've replaced the intercooler piping with a set that's actually made for the car. I can feel it pick-up a little better, but I'm still unable to boost above 5psi. The car acts like it's hitting a fuel cut, it has a horrible misfire and won't pull through it. I can rev to redline but as soon as I get right around 5psi it just hits this wall. I haven't been able to get over 1/2 throttle without it doing this.

I've double checked my vacuum lines since those were also messed up when I purchased the car. I've been looking into getting rid of them, but haven't found the answers I'm looking for about that yet...

Where do I start? I hate this problem!
Here's a picture of my engine bay, maybe you can notice a big problem that I've looked over.