2015 GMC 6.2 Tune, Flex conversion

Here is a great example of gains that should be expected with our mail order tune and flex fuel conversion on a 14+ 6.2 L86. By far the best performance modification per/$$.


  • Tune gains 21whp and 26 ft/lbs
  • Tune +E85 38whp and 38 ft/lbs

I've been driving around with it for just a few days, but it's really strong now and today the fun surprise was this. E85,$1.49 Instead of Premium $2.46