http://www.d24t.com/showthread.php?t=244
read through that thread and you will see some good pics and info.
You should get a NA manifold, the off boost response and torque is better, along with having a nice size 3" inlet to plumb your piping to. I would also check your turbo out, it sounds like there is something wrong with it, either the waste gate is leaking/hung open, or the turbo is worn badly. Such as the compressor wheel rubbing on the housing, etc. The stock turbo normally spools instantly, thanks to its tiny .36 a/r exhaust housing.
Jason