I will definitely plug the Apex'i World Sport 2. I run one on my LS...it has a very nice exhaust note, but it isn't obnoxiously loud. It doesn't drone or hum at highway speeds and still flows quite well for a chambered exhaust. If your friend is concerned about rust, then look into the RSR ExMag. It's a full stainless steel exhaust, so rust-through should not be an issue.

And just out of curiosity, why hasn't this guy signed up on the board on his own?