I have a 2008 gmc sierra 1500, i want to put a super 44 series flowmaster on it what size inlet do i need?

What inlet does the flowmaster have to have to fit my truck?|||you probably have the gm odd size of 2.75 (id). so 2.5 or 3 will work. you may need a muffler shop to make you adapters.|||measure it with a tape measure then order or buy what you need|||If you are just cutting your muffler off and replacing it it should be 2 1/2 inlet. but you can go to any muffler shop and they will do it for you. they might even have the super 44s there.