What would be a good tuner to purchase if I only had an axle back exhaust?

 

I have a sct x3 and i like it. Got it from am. Free tunes for life.

 

I don't plan on doing any major engine mods. Just an axle back exhaust. Would the sct tuner with pre-loaded tunes be a good choice? I was also looking at the diablosport tuner. I had a diablosport tuner for my charger rt and it worked great but i'm new to mustang tuners.

 

Diablo sport would probably be just as good. I have no experience with it though so I can't say too much.

 

Do you need one?