E85 woke up my Mach 1 and I'm happy with the power level and ability to maintain traction and overall drivability on street tires. I was considering an ESS boost upgrade to keep further supporting modifications manageable for daily use and occasional HPDE track days until I got a ride in a tuned BMW M3 that was basically stock and able to use its 750 horsepower without wheelspin concerns. If I want more horsepower than my existing Coyote, I'll convert to a car with AWD.