Chi-TownSRT6 has this tuning. He was satified with it. If your not doing any mods, like pulleys or cold air intake then tune alone would make a difference if you just want a little bump in performance. If you decide to do mods later then you will have to redo your tune. The flipside is if you do the mods, that the car's ECU can adjust for it. The tuning fine tunes it all to optimize the whole set up. I think needswings intake and the basic tuning give about the same performance. If you couple all of them then your talking some serious power to the SRT's.

Cruzinquick