I have the EFI live with DSP5 switch and I'm extremely happy with it. We drove over 8000 miles last summer and the truck towed great. The tune with the turbo brake made going down steep grades a breeze. I averaged 12 to 13 MPG towing with 2 adults and 2 children the entire trip.
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Bert, Cathy, Kylie & Kaitlin
2014 SunsetTrail Reserve 32BH
2009 Silverado 3500HD LTZ 4X4 6.6L Duramax
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