Aftermarket motorcycle exhausts can potentially increase horsepower, but the extent of the increase can vary depending on various factors.
One of the main reasons why aftermarket exhausts may contribute to increased horsepower is by improving the exhaust gas flow. Stock exhaust systems are designed to meet certain noise and emissions regulations, which can sometimes restrict the flow of exhaust gases and impede performance. Aftermarket exhausts, on the other hand, are often designed with performance in mind and may have larger-diameter pipes, fewer bends, and less restrictive mufflers, allowing for better airflow.
By improving the exhaust gas flow, aftermarket exhausts can help the engine breathe more efficiently, potentially leading to a modest increase in horsepower and torque. However, the actual power gains will depend on several factors, including the specific motorcycle model, engine design, tuning, and the overall condition of the bike.
It's important to note that simply installing an aftermarket exhaust may not yield substantial gains on its own. To fully capitalize on the potential benefits, it may be necessary to tune the engine's fuel injection or carburetion and make other modifications to ensure optimal performance. This could involve adjusting the air-fuel mixture, ignition timing, or other parameters to suit the new exhaust system and maximize power gains.
Additionally, the perception of increased horsepower can also be influenced by the sound and feel of the motorcycle with a new exhaust. The change in sound and exhaust note can create a more aggressive and powerful impression, even if the actual power gains are relatively modest.
In summary, while aftermarket motorcycle exhausts can potentially increase horsepower, the actual gains can vary and may require additional modifications to fully optimize performance. If you're considering an aftermarket exhaust, it's advisable to consult with motorcycle experts or tuners who can provide guidance specific to your bike and help you achieve the desired results.