I have the same set up as you do and I am running the same boost. I cant get any more psi without a boost controller. I have the stock exhaust piping on my car though. Hopefully when I get a bigger exhaust it might let it hit 7-8 psi. It could be that when you shift, your rpms are already near 4000 so it doesnt really matter where in the rpm range it hits full boost. It matters how LONG it takes for it to get to full boost. An example is like if you are cruising in 5th gear at like 90mph and let off the gas for a second then floor it. You wont hit full boost until probably 4000-4500 rpm or maybe higher because your rpms are already in the high range. Hope that made some sense?

DAVE_FL
97 T-GS
HRC stage 2

Orlando DSM www.orl.dsm.org
DAVE99@cfl.rr.com