gmcandredsox
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So I am trying to squeek out as much HP for my 03 Sierra 5.3. I bought a dual exhaust from flowmaster, cat back system. I am going to buy a K&N cold air intake. I am going to install them this weekend. I also want to buy a programmer, but not too sure what to buy. The super chip programmers are over $300. But I also seen chips and moduals for $130, can anyone tell me which one would be better for me and my truck. Any help or suggestions would be great! Thanks.
Wayne
Wayne