funny boost
 

Alright guys i searhed around the forum and haven't been able to find anything but i installed my 99 y-pipe yesterday and know she wont boost at high rpms. if i cruise in fifth and then give it gas it will boost perfectly all day but if im rolling around at like 3000 or so and punch it i wont get anymore than 5 pounds. it ran perfect before and i didn't touch my blow off valve or my boost controler so i dont have a clue what it could be, and i cant get in touch with my mech until in the morning. any help is appreciated.

I went back today and double check everything, the only thing i can think of is that i should of replaced the rear turbo inlet gasket but the kit didn't come with one and the engine has less than 700 miles on it so i thought it would be good, but it is the paper one.