when im on the freeway and i tryed gunning it but when it reaches pass 4000rpm the car cut out. what doesnt that mean, but it was the first time that I tryed boosting all the way. when I start off the line it had no problem but after 3,4,5 gears it does it. could it be bad injectors? or fuel pump? my mod are v mount ic/ rad, dp- mid- cat exhaust, greddy pulleys, re intake.

 

sounds like a fuel cut. You might want to look into engine management.

 

yeah, I might have the same problem that u have. I boost at 10 psi under 4500 rpm then over 4500 rpm when the second turbos suppose to kick in, it doesnt, only 2 psi. . I just recently put 99 spec twins and put silicon vac lines. i'm still trying to figure it out and if i figure out i'll post something up to help out.