I wouldn't say that. Buying a Bosal is a good product that will ensure you never have to replace any exhuast component again. My bro's Z has a very intricate exhaust with four mufflers and a ton of tubing. It's not cheap, now he doesn't have to worry about replacement again because of the SS build quaility.
IF you want a good exhaust without adding a louder exhaust note, Bosal is a good choice.