Just asking, because it is VERY rare to tune in 4th. I have my tuning done by Nuke at NF performance. I know it's a blast to drive as I'm at 321 on 92 octane (dyno numbers from RS Motors in Burnsville). I have no desire to run E85 because it is not always available out on the road and the mileage sucks.
If you woke up today, you have another chance to do it right.