Long tubes can make some power but if you want to skip that, mid pipe with cat deletes will make power. Axle back is more for tone vs power like mentioned. Cai and tune will net power too, mostly from tune, but if you want to keep squeezing all you can, get a cai. For the hot box, yes it will suck in hot air and while sitting your iat's will increase but once moving they will drop to ambient to around 10 degrees above. For tuners.. Lund or AED.
If you want the boss im, you'll need a good tuner. And eventually long tubes so it'll exhale better. Also if you have e85 near you, get Lunds or AED's flex fuel tune.
Lund or AED over Bama?