Please Help!

[red91GSX]

i have done all the free mods to increase the amount of boost i was getting from my factory turbo setup. i'm still using the factory boost gauge. i went from roughly 10 / 11 psi up to about 13 / 14 with the mods listed in my profile. i did the mods about 4 months ago and it was runnin great 'cept for the slight drag under acceleration (i think from clogged fuel filter or something). about a month ago i put in a k&n filter and shortly there after noticed the loss or nonappearance of power. now for some reason i'm only able to pull about 7 / 8 lbs of boost. can anyone out there help me with the how's and why's?

 

[90GSX]

First off, the factory gauge is about as useless as goose $hit on a pump handle; Get an aftermarket gauge.

The standard things to check for are boost leaks, leaks/ruptures in the MAS intake piping, fouled plugs, arching/bad plug wires, clogged cat.con., etc... check all the basic stuff, when you've ruled out all of theis, then we might be able to help you with a more serious problem.