Anyone will tell you that a good-sounding pipe can help get your bike to stand out when riding down the road, but with all the restrictions today on what can be done to your bike, it's hard to modify and keep from getting tickets and voiding the warranty. When it comes to your Harley-Davidson, there are a few ways to go and still keep your bike legal. We wanted to get a better sound from our long-term test bike, a 2007 Dyna Street Bob. The bike runs great with its 96ci motor and 6-speed transmission, but with the stock exhaust you can't tell the bike is running until you ride up next to a big-rig or something that bounces the sound back at you. We called over to the bigwigs at Harley-Davidson to find out what we could do to get what we wanted from the bike while still keeping it within factory specs. We were told about the 49-state legal Screamin' Eagle Baloney cut slip-on mufflers with a unique baffle design that improves power potential, adding a deeper bass sound instead of loudness. (Not legal for sale or use on California catalyst-equipped vehicles.) Then we were also informed that as a combo to add the Screamin' Eagle air filter and backing plate we could add horsepower and torque. We had to give it a try, so we stopped off at Pomona Harley-Davidson in Montclair, California to get the mufflers and air filter installed and run a few dyno runs to test everything.
 Here is the Screamin' Eagle...  Here is the Screamin' Eagle muffler slip-on and air filter kit with replacement backing plate. |  To get started, Tony Denius...  To get started, Tony Denius and Chris Biles placed the bike on the dyno, then checked the tire pressure, oil, and fuel. Then they brought the bike up to operating temp, and during the first run found that this bike needed to get an H-D recall download called a smoothing program. Once we got everything downloaded, we did the first pull on the dyno and got 68.9 horsepower and 85.5 lb-ft of torque. |  After the pipes cooled down,...  After the pipes cooled down, Chris removed the mounting bracket from the frame. |
 Then he unbolted the mufflers...  Then he unbolted the mufflers by loosening the clamps. |  Before the new mufflers were...  Before the new mufflers were installed on the bike, Tony covered the inside of the old clamp with anti-seize to help keep the clamp from moving and coming loose. He told us we should replace them, but if you don't have new clamps, anti-seize will work. |  Then Chris installed the new...  Then Chris installed the new Screamin' Eagle slip-on mufflers. |