What needs to be altered on the 2013s to run E85?
Does it work best with a mods or can you get HP benefits
with the stock motor, and how much?
You will need a boost a pump
And upgraded injectors
I recommend ID1000's
And tune is required
You will see more power, I believe you can run more boost with E85
I get around 200 miles per tank.
The 13 - 14 GT500's have dual 5.0 pumps. Yes, the additional voltage drives the pump harder but all testing and indications show that these 5.0 pumps are more than capable of handling the additional voltage and output.
Can you simply swap back and forth between 93 and E85 tunes to use either fuel you want so long as you make all the proper changes for E85 or do you need to stick with E85 once you change over?