In my 91 3.8 Regal Custom, I did the front brakes in March of 06 and then I had an automotive shop do the rears. Ever since then, it seems like it takes my car a while to stop, they put new semi-metallic pads on it, would that make it not stop so great?

Muffler ? is, Is there anything I could put on my car that would not have that standard 6 cylinder sound? Not a deeper ricey sound, but something more aggresive?

It sounds like your rear brakes & parking brake are not properly adjusted. Use this (http://autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0e/e1/ac/0900823d800ee1ac.jsp#hd1-1-3) procedure on the rear.

Altering the sound of a nice, quite Buick, makes about as much sense as jumping out of a perfectly good airplane!:shakehead