When I was thinking of using those injectors #12580681 they are the same as the 8.1 truck injectors. I was going to use the 2004 8.1 truck #'s. I swapped intake manifolds but I realized I would need plug adapters for the 2008 injectors so I swapped my 8.1 truck injectors into my 2008 manifold. Just look at my tune.
I used a 8.1 injector data for my setup. When I looked at 2008 injectors non flex fuel tune the injectors are the same as the 8.1 injectors lbs/hr. I would call john at fic http://fuelinjectorconnection.com/sh...iewCat&catId=4 He will help you out.
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