Well, the car will run better, and sound sexy as all get out. :laugh:
Seriously, I had the same issues (clogged precats), called Marty at MSDS, and got a set of headers. Much cheaper than buying new manifolds, with a performance gain to boot.
If i were to do headers, i'd like to spend as little money as possible, do i need to replace anything else, y-pipe blah blah blah?