Well...a proper tune will free up bottom end grunt and top end power. This isn't a pushrod 5.0. This thing has VCT tables, huge closed loop processing power, incredible fueling precision. It truly is win-win.
You really need someone who understands automatic tuning. That should focus your attention on VMP or Mike Rousch, both of whom have huge positive reputations with the auto crowd.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.38 at 120.85
2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP