The first thing most people do when they buy a motorcycle is replace the exhaust system. Nothing is quite as sweet as a new set of pipes. When you start looking at the exhaust that is right for you there are a few key elements to keep in mind. No matter what style of bike you have there are two types of exhaust pipes to choose from: Slip-on or full system. A slip-on pipe from a manufacturer like FMF, Pro Circuit, Cobra or Vance & Hines is the easiest upgrade of the two. Simply remove the old or stock canister or muffler (depending on what generation you are from) and slip-on the new can. Voila, you get the aesthetic upgrade, reduced weight, an improved exhaust sound plus a marginal performance increase whether you are talking about a street bike, cruiser or dirt bike. A slip-on system doesn’t always require any modification to your carburetor or fuel-injection either. A full exhaust system includes the header or head pipes plus the canisters or mufflers. Installation is a more in-depth process but the benefits are three-fold. First of all there is usually a dramatic weight reduction between a stock and aftermarket exhaust system. You will generally see at least a 10% increase in horsepower if everything is done right. In the case of a carbureted motorcycle you will need to re-jet your bike. In the case of a fuel-injected bike, you should also install an adjustable ECU in order to get maximum benefit from the free flowing exhaust system. The industry standard is the Dynojet Power Commander but many of the major exhaust manufacturers now offer proprietary versions including Yoshimura, Vance & Hines, Bazzaz and Cobra.