The main purpose of the exhaust system is to direct the post-combustion gasses from the engine cylinder and away from the rider out into the atmosphere. Exhaust pipes are also used to help the engine run smoother by supplying back pressure through pipe length and cross sectional area.
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Probably the most important aspect from the riders point of view is that it routes the hot gasses from the engine after combustion. Standard motorcycle exhaust will house a catalytic converter which helps convert the carbon monoxide expelled from the engine into carbon dioxide which at least makes it slightly more environmentally friendly.
The exhaust system with the help of the muffler also reduces noise. The muffler has nothing to do with exhaust emissions - nor with engine performance.
But finally, the exhaust performs a major function when it comes to how your engine performs. Aftermarket exhaust systems can help increase your engines horsepower by being ‘less restrictive’.
Your engine and exhaust system actually are designed to work together. It gets very technical and the practical application of how it all works includes things like reflected pressure waves. Without an exhaust connected to your engine, you’d be introducing air directly into the system in the wrong direction through the exhaust ports which would cause serious damage.
Slip-on exhausts increase performance, but it’s got nothing to do with improving engine efficiency. It’s simply that most of the time an aftermarket exhaust will weigh less than what comes standard on your bike.
Motorcycle manufacturers are out to make a profit which means where possible, they’ll use cheaper components to save money. A muffler is usually one of those cheap components. It doesn’t hurt the engine performance in any way, but cheap on a motorcycle often means heavy - and OEM mufflers are often very, very heavy. Aftermarket exhausts on the other hand are priced in such a way that they can weigh many kilos less than what comes standard on your bike. Weight saving is a performance improvement. But they don’t increase horsepower.
Where a modified exhaust system does increase horsepower is in the header pipes connected directly to the exhaust ports. The less restrictive these are (i.e. the easier it is for the exhaust gasses to be expelled) the more horsepower gain there will be. If you compare a stock exhaust system next to an aftermarket one, you’ll often notice that the there are less bends (or gentler ones) and the headers will often direct gasses to one side of the bike instead of both - lessening the overall distance gasses need to be expelled.
Finally, another reason a full exhaust performs better is the lack of a resonator. A resonator, like a muffler, is designed to reduce noise. You’ll know your exhaust system has one because it’s an almost rectangular shaped bulge in the pipes - usually situated halfway between the muffler and the headers. It’s just another part that restricts the exhaust gasses and hence by not having one, horsepower is increased again.
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