Don't get the cart before the horse. The guys at KB are the best. Install the 2.1 and run 93 octane and enjoy. Don't start worrying about add-ons until the smile comes off your face. And Never, Ever, listen to the "experts" who know what works despite what KB says. KB is the only people you should ask for help until you have alot of your own experience to guide you. NO DISREDPEST MEANT TO ANYONE HERE.