Number seems low for the Mods but all depends on what dyno as well. Does the car have bigger injectors? If not you might be running out of fuel. I would think that combo should be closer to the 600 mark. My car made safely made 575 on a dyno jet with AHP package 4 heads, BTR stage 3 cam, AHP 2" headers / no cats, and FID 700 injectors, stock intake and TB. I have a ported MSD and a NW 103 sitting hoping to crack 600.
I would say after the TB there is not much more to do without getting way deep into it.
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