^ You are thinking correctly...same one I have.
If you are replacing the tubing from the cat to the muffler do not go bigger than 2.5" because you will lose exhaust flow (scavange)!!
EDIT: I know i am in the wrong catergory as my car has the 3.4 but the exhaust should still be the same.
__________________
2008 Chevrolet Silverado 1500 LT1 Z71/4x4
2000 Oldsmobile Alero GLS - Sold
-------------------------------------------------------
|