WHY? Looks. Noise. Performance. Why does any motorcycle owner switch to an aftermarket exhaust? I'm pretty well satisfied with the looks, sound and performance of the stock pipes on my V-Strom 1000 so I elected to leave it alone; when I purchased the Wee-Strom, however, it sported a nice, shiny Staintune muffler. I have used this Australian-made exhaust on a Honda ST1300 and was really impressed by its quality; the muffler on the DL650 looked equally nice. You can find Staintune pipes directly from the manufacturer or from aftermarket suppliers such as Motorsports Network for about $440.
INSTALLATION. Although I didn't install this muffler it looks like a pretty easy job--it simply slips on to the stock exhaust pipe and clamps into place. Like other Staintune exhausts, this one came with a restrictor pipe that slips into the muffler outlet and further muffler the sound. Want a little more noise? Simply loosen the allen-head set screw and slip the restrictor from the muffler outlet.
RESULTS. It's hard to dislike the appearance of this exhaust--it's a nice-looking piece of equipment, and the lines integrate well with the rest of the bike. With the restrictor in place the volume level is very quiet--only slightly louder than the stock pipe. Remove the restrictor and the sound is more aggressive; on acceleration it emits a nice snarl without being obnoxious (at least to this old man's ears anyway). You'll generally not get much of a performance increase with a simple muffler switch, so I wouldn't anticipate that the new unit provided much in the way of horsepower increase.
Worth the money? Not for me. It's a nice-looking exhaust, and the construction is absolutely first-rate; this stainless muffler should last a long time--it's just not enough of an improvement to justify its cost. I can think of many better ways to spend over $400 on this bike.