The Borla downpipe is nice because it also incorporates a resonator delete, killing 2 birds with one stone. One thing to keep in mind though, if you plan on using a cat-back other than stock or Borla, you may need to do some modifying to make everything fit together.
Why did they make a downpipe that requires you to cut the factory cat-back is beyond me. The factory cat-back is one piece from the downpipe to the tips, so looking at that y-pipe they include you have to chop your exhaust yourself.