I would go with the Vortech. They have been doing this right for a long time and the chargers are very efficient. The last thing you want is more low end torque. Mustangs have a hard enough time hooking-up. If you run 8psi or under you shouldnt need an after charger but it will help. If you want to cool the charger you can always us a 25 shot of Nitrous.

If you are serious about getting a charger PM me.