Hence the popularity of cat-back kits. That's the only way to go 'bolt on'. Anything else will require welding.
Actually there is a way to do it yourself with adapters & such with pipe clamps available at most auto parts stores. Past experience has taught me however that it will be a lesson in frustration (not strong & lotsa leaks). The best day of my life was the day I had a shop trash my 'redneck engineered' exhaust and weld in a quality one.