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We carry SCT programmers and our Infinity monitor/programmer. Both of which will hold custom tunes. You can check out all of our 6.0L tuning options available HERE.
I had an SCT with custome tunes in my 6.0L and I never had one issue. Awesome programs too...the Hybrid he built was freakin badass. It may be the same Matt Geouge? (sp)...but its been a while. I belueve it was Spartan that built mine. Id have to look for sure. At the time there was some sort of partnership split, but the remaining partner was awesome. While everyone else was blowin 6.0L's up, I was bookin with no issues. My next truck will have his tunes 100% sure.
I have to third that I really like the SRL from Gearhead and they
are very good and easy to work with. Also my MPG is now coming up
now that I am getting used to the new play toy effect(WOW response).