Straight through glass pack designed mufflers!

Is this kind of muffler better than a straight pipe it?? i'm afraid if i take my straight pipe off and put this muffler on it will take that hollow sound of a v8 out and muffle it? it's a 3.8L . Also does this kind of muffler increase pressure, helping force exhaust gases out increasing horsepower?

Opinions would be apreciated!! thanx dudes !

Glass packs make a great sound but are legal in most places for mufflers. They add no back pressure and are just like straight pipes with a lower tone. They were popular in the 60's and 70's but have lost favor when the low back pressure mufflers became available.