I'm looking to build a solid platfom for some serious power later. I'm getting a Fluidapmner and MBRP exhaust today (keeping cat for emisions). I'm debating whether I should get a FASS system (still researching what brand) or a Quad XZT or SMARTY. I have stock trans still and will be upgrading that after this set of mods. So my Question is which one should I go with right now? I'm more concerned with mpg's and a smoother running machine at this time (mainly because of trans). I'd like to upgrade trans too, but not enough money for all at once. Thanks for any input.