If you haven't heard them on a car yet, I just finished up my before/after exhaust video. Here are the Magnaflows on my 1993.
[media]http://www.jtiff.com/viper/exhaust.mov[/media]
In June, I changed out the stock exhaust on my Viper. In this video you'll first hear the start, idle and 4000RPM rev with the stock exhaust, consisting of the stock exhaust manifold, stock catalytic converters and stock mufflers. The second half of the clip plays the start, idle and 4000RPM rev with the same exhaust manifold, but no cats and new Magnaflow mufflers. As you can hear, the exhaust note changed slightly at idle but isn't any louder and produces no drone. It's only when you're getting on it or when you're decelerating that you hear the major differences. It smells and backfires now, but it sounds MEAN.