You still use your stock intake mani.
When you remove the whole assembly from your truck,you'll see where they unbolt from eachother.Youll also see where the heat plate bolts back on your intake.
I drove mine to the muff shop with open headers,,about 8 miles,
i figured if i got stopped,it would be obvious to the cop where i was going. Small town,one exhaust shop.
Good Luck,
