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  1. Chevy Silverado Forum (GMC Sierra)
    I have an 05 4.3 extended cab automatic 2wd. Has anyone heard of swapping a mercruser mpi intake manifold for a few extra horses? They make 220 at the prop. Which is probably 250 at the crankshaft. And you can easily add boost and bigger injectors. It seams like the wiring would be a possible...
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