Go with the STS kit I have one on my Silverado SS with the 6.0 and it will get up on it. As for fuel economy yot will gain 1-2 MPG at cruise as I have and you will do even better with a Nelson tune.
Really go with the STS you won't regret it
ssblackss
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'03 silverado SS, STS turbo, GT67, 8lbs boost, Alky-Control PAC methanol Injection system, 282's, 160 stat, Nelson Performance tune, Jag specialities custom shift kit with Billet parts, Mcgaughys 2/3.5 drop, on 22's.
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