Exhaust systems

I am after a 3" . but want im looking for is a direct bolt on systems , whos used what and how well they bolt up.
previous to this 6.1 set up I was running hooker headers on my rb block . the 3" set up that I had is not going to fit . So by the time I get this car to a muffler shop wont be for a few months .
Cant want that long unless I have too.!
Hence now looking at kits????