Few questions - Servo buddy

So I don’t mind my yoshi slip on, but definitely am looking for a louder sound.. I’ve got a toce slip on coming in soon and a buddy of mine says a servo buddy is a must. I’ve never used one, that I know of, and am not entirely sold on installing one in my bike. Are they worth it? Do they affect the sound/performance of the bike at all? Honestly just looking to educate myself here. Thanks all