How difficult is it to remove the stock exhaust from the cat back? Does it just unbolt and slide out of hangers or do you have to cut it?

I am thinking about getting a Magnaflow bolt on system.

 

in theory, yes. but on my 02 the stock intermediate pipe and clamps were very corroded so they did not unbolt and i had to cut it with a grinder.

your 07 should be in better shape, as it didnt have to go through midwestern winters with roadsalt, is my guess so it might work.

 

You can un-bolt it if its not surface rusted, but un-bolting takes all the fun out of sawzall cutting