Joe lives a few miles from our shop in Ohio, and just purchased his beautiful ATS-V from someone in Texas. After performing some fuel system upgrades to get him up to our Purple Belt Performance Package level, we did a baseline pump gas run on his previous tune. The car made respectable peak power of 498 whp and 490 wtq on 93-octane fuel. With no changes other than our custom tuning, we improved his numbers to 518 whp and 555 wtq. That’s 20 more whp and 65 more wtq than another well known ATS-V tuner. And the best was yet to come. We then added some ethanol and tuned the car on an E50 fuel mix. Final results were 604 whp and 628 whp, with a much improved powerband.