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word on the street is they are gonna be making a V6 duramax for the 1500 silverado and they say that off the assembly line it will do a sub-14 second 1/4 mile.. not sure when, i just heard it through the grapevine.
Thats a step in the right direction, to bad I hate the newer silverados.
the headers were a MOTHER****ER to do but aside from that i dont think they would work for you on account of your 4x4 drivetrain. the power gains were great the butt dyno was really impressive.
keep dreamin man. fact of the matter is that we all have trucks. now, i'm not saying that a truck cant be fast (lightning, cyclone, built R/T) but it takes a considerable amount of money and it will always be heavy. the same motor that it would take to make my truck run 13.5 would make and average size car go 13.0 or faster. just a sad fact.