So I swung by the local dealership and so either an 04 or 05 F, and i thought the exhaust looked bigger, I noticed the can look a bit larger but the pipe after the two come together is considrably larger than my stock exhaust.

Any else notice?

Could I swap exhaust?

The 04 pipe is larger dia ... but the headers and the point ewhre they join is the same as before ... about 2 inches after the weld the thing has a larger pipe slipped on and welded ... Dont have anyhting to gain with swapping I think.
Cool.
Srinath.