I also have used Speartech with great results on factory stuff. For full aftermarket I use the MEFI 4 and soon to be MEFI 5 from MSD. Great systems, come with the wiring harness, computer, and tuning software for about $1850.00. Will run LS1/LS2/LS6 and LS7 engines as well as RamJet crate engines.
Tyler
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