New Exhaust....

Does anybody know where to get a full exhaust system from? My end can has quite a lot of rust and tarnishing on the chrome, however the silencer has been welded to the main body of the exhaust so I don't have the option of simply replacing the silencer. I have looked around but does not seem to be anything?

can anyone help? If I can get an aftermarket exhaust with a few more hp at the same time....bonus

thanks