Just picked up a 07 GT five speed with a Saleen Stage 1 blower. That was put on by JDM Engineering in Jersey. Day one boost hit 8 psi no problem held steady untill you let off the gas day two hardly wants to hit 4 psi and the boost gauge flutters like a butterfly. Car still seems to be running great but it just weird i know it should hold steady... Anyone have and ideas or info on what i can do to fix or check? All help is greatly appreciated... Thanks