Does anyone know if my gibson exhaust I have on my 06 nissan titan fit on my 07 nissan armada? Or did nissan change the exhaust

The Y pipe and muffler are the same. The tail pipes are different. The Titan has a longer wheel base, and the solid rear axle vs the IRS also make a difference. You could use the Gibson system back to the muffler and buy (or have made) a Armada tail pipe.