I have a TB and K&N filter on a 2010 RTS and adding the juice box decreased the back firing and popping, but I am still not totally sold on the performance end. I have been considering going to a power commander with the auto tune. The big question is why do you think you need a JB. Is your RS running well with the TB alone? Are you looking for better performance or were you just looking for the sound the TB gave you? Are you concerned about damaging the engine? For me, it has been all about performance and trying to get as much out of my RT as I can without burning it down (I know I could just get an RS and be done with it, but then I would be blowing my benjamins trying to get the RS to have the amenities of the RT). I added the JB for a little more control, but without putting it on a dyno though, it is all just a WAG (per Lamonster), a Wild Ass Guess. The auto tune samples your exhaust and makes changes based on real data, not that I understand one tenth of what the heck it all does. If you feel compelled to add a fuel controller, I would go with PC with auto tune, but if your running well with the TB alone and are happy maybe you don't need it. Good luck.