need help.... 04 gt with my novi 1k and a horrible dyno

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Well today I went to dynoed my car for the first time since,I bought the car already modded..so my numbers were 285rwhp and 295tq on a dynojet..now the problem is that I have a novi 1000 boosting 8psi,and I think is really low since similar combos are running 370ish..the guy that did the pull said that it shows the 8lbs but he didn't know why it was low,...and that I can do a tune with them etc etc......so I would really appreciated if somebody has an idea of why it dynoed like that.. my mods are:
Novi 1000 rr 8psi
lightning 90mm mass
Anderson powerpipe
C&l pipes and plenum
Bosch bypass valve
42lbs injectors
Kenne bell boost a pump
Pypes x-pipe with high flow cats
Spintech mufflers and catback
Diablosport delta revolution chip
Also car is a 5 speed manual
It was done at a dynojet dyno, at 46 degrees temp,and 61% humidity, guy said that the airfuel looked good,
Thanks for any help you guys can provide me

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I've never heard of anyone using the stock gt fuel pump with the kenne bell boost a pump...i would recommend upgrading to at-least a focus pump....