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You can purchase headers with or without the y pipe. Ecu will need to be unlocked if it is a model year 2015 or newer.
Stick with 1 3/4",and don't do true duals.A basically stock truck like you have won't gain anything from a true dual set-up,and there's a good chance it'll lose bottom end torque from them.Do a quality catback system that's a full 2.5" after the muffler and uses mandrel bends.BTW back pressure is a myth,or wifes tail if you're so inclined that way,lol. Exhaust scavenging is what you need to research.
I ran a Magnaflow catback on my 4X4 and liked it,truck ran corrected 11.50's with the Maggy catback system. Either brand of headers should fit your 4X4,i run JBA's on my 4X4.On a stock truck 2.5" after the mufflers is about what you want.If you're boosted or spraying it with nitrous,then the 3" would be an okay upgrade,but if not stick with 2.5". I'd seriously consider wrapping the headers though,as the knock sensors are right under the primary pipes,and have been known to have issues with picking up false knock from the internal pinging in the primaries. Stay away from Stage 8 fasteners also,as the clips have a tendenancy to rattle,and ***** the knock sensors too.Remflex 6022 gaskets have probably the best rep as far as header gaskets go these days,they only require 20 lb-ft of torque and don't require retorquing,just don't bend them,as they don't take well to being flexed.
