That's what it is, but removing it is a little more complicated than that. Over on apriliaforums.com, there is a detailed description of what to remove, what to plug, and what to connect together. They call it the "canisterectomy". Gearing Update: So I went for an 8-hour ride to and around the San Francisco Bay Area to buy a helmet from an inmate and visit friends and whatnot. It's been a while since I've ridden around the San Jose area, and boy does traffic flow fast now! It seemed to average between 80 and 90 mph. With a 48 tooth rear sprocket, the DD hums along at 6000 to 7000 rpm between 80 and 100 mph. The stock exhaust is actually a bit loud at those rpm's, and the bike seemed to love it! Throttle reponse was almost instant (I kept it in "Tour" mode all day), which was good during the one close call I had that day. Another car and I chose the middle lane at the same time, and a quick rapp of the throttle got me about 5 feet ahead of her bumper just in time. She continued to tailgate me, so I stretched the DD's legs a bit to find another pocket away from the offending car. The bike can still do 120 easily, but the 80 to 100 bracket was lots of fun. For those who plan to use their DD for travelling, you may not want to change the gearing much more than I have, or you may find yourself maxed out on top speed during jaunts like this. For me, adding two teeth to the rear is turning out to be perfect. P.S. The new XD4 helmet I picked up really reduced wind drag on my head, too. It was so much quieter than my old helmet it felt like I was wearing ear plugs.