i've seen the drag4 kit w/ intercooler, cast-iron manifold ..... for 2999 shipped.
xs engineering w/ intercooler, manifold.....3200 shipped for 6.5+, 3500 for a 400hp kit for built motors
revhard stage 2 and 2c.........2700 & 2825
all these prices are off groupbuycenter.com, so i say the normal price is close to 3k, i'd imagine you could find some cheaper but this is what i came up w/ quick glance
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