i have a great running turbo b20. boosting 10psi with a inline pro cast manifold. holset he 351 cw turbo, 4 inch open dp. i bought a vtec head, gsr cams, skunk 2 cam gears, je 9:1 pistons and eagle h beams. will i lose any power adding these parts? what will my power band be like. right now it comes alive at like 3900, pulls hard till 65 then feels like it falls off up top.

 

looks like you need to get to your tuner to see why power is falling off so early.... especially if your considering changing parts up