If you mean this Airaid and Tuner Package, then the two biggest differences is that the Airaid package does not come with a cat-back, but does include 5-Star's custom tuning, while this Phase 1 Package includes a cat-back, but only comes with a standard SCT Livewire with pre-loaded performance tunes. If you want to swap out the exhaust system with this package, just give us a call directly at 1-877-578-2433 so we can put together a custom order.