DD motorcycle exhausts are very popular aftermarket exhausts with many bikers. D&D was started in 1972 by David Rash after he made an exhaust for his own bike. Well, 30+ years later, the technology has greatly improved, but the basic idea remains-the D&D exhaust is a high quality, high performance exhaust.

DD motorcycle exhausts have 3 main components:
1. First, you have the headpipe, which bolts to the head and funnels all the gases out of the engine. That empties into..
2. The midpipe: this is where design is very critical for maximum flow.
3. Finally, you have the silencer, which muffles the sound and sparks. D&D offers several types and styles of silencers to suit individual needs.

Typically, an aftermarket motorcycle exhaust is an easy and affordable way to get improved performance from your bike. In addition to performance, you also get a look and sound that makes your bike unique.
Some things you should consider before buying a DD motorcycle exhaust:
o How the exhaust mounting system is going to affect the rear footpegs. Some systems require their removal, which means no more riding with a passenger.
o Performance: the thought of bolting on a no-name, big-bore motorcycle exhaust might sound good, but if the exhaust wasn't tested and tuned, chances are you'll actually hurt your horsepower. Try to get a dyno sheet on a particular exhaust that compares stock to the new exhaust to make sure you're getting extra horses for your money.
o Check your carb jetting. It may sound odd, but the carbs are jetted to work with the stock exhaust, so when you change the exhaust, the carb should be adjusted accordingly. Most shops can do this inexpensively, so don't skimp on this step.