everything in my sig with a single 6" stack. when I 1st put it all together I had the same theory everyone else 1st things more fuel more power until I hooked up to a buddies 40' GN loaded pretty good and I couldnt get outa my own way once I backed it off some it opened up alot more its a bit of trial and error just takes time not one set-up will work on every truck. Good luck man.