I installed a full Titanium exhaust on my BMW GS - and my wife really didn't like it. At idle it was fine (I had the baffles in to keep it quieter), but under any type of hard acceleration, it got loud (great sounding). She didn't notice any difference with the RTL CAT delete at idle or under acceleration so 2 thumbs up. It is lighter, keeps the heat down and with a custom tune, runs great. Is it radically different than stock. No. A little different? Maybe, it is really hard to tell But it does run great!