will 04-05 stock exhaust fit onto 00-03 s2k?
 

will it fit without any modifications?

The hangers are different, BUT, it should fit. I am not 100% positive. However, I have placed aftermarket exhausts made for an '03 on my '04 and they fit fine.

might look funny with the oval tips, i don't know what your rear bumper looks like though.
if you just want stock, why not just get someone's 03 exhaust, i'm sure you would save some cash.