The test engine must be equipped with high performance components, such as a cam, ignition, air cleaner & Thunderheader ™. The best way to test or compare high-performance exhaust systems is with a Dynamometer.
THUNDERHEADER SLIP ONS FOR DYNA INSTALL
This means it has to breathe, if you install a high performance cam, carburetor, air cleaner, ignition & exhaust system, you can expect to increase your horsepower about 30-40% over stock, on most HARLEY-DAVIDSON EVOLUTION models. Your engine must have the proper components necessary to produce maximum horsepower output. The addition of a high performance exhaust system alone is not enough to achieve maximum horsepower & torque. Not only will the exhaust system affect peak horsepower, torque & RPM, it also can change throttle response, gas mileage, vibration & engine temperature. The exhaust system has a very dramatic effect on how a engine operates throughout the entire RPM range. A stock cam & air cleaner will limit the performance of your engine, even with a high performance exhaust system installed. If your engine is equipped with at least a high performance cam & air cleaner, your performance gains will be significant. For motorcycles used only for racing, other modications can be considered. For the motorcycle to remain legal for street use, other modications must be limited to those that have been approved by the California Air Resources Board (CARB). How a Thunderheader ™ exhaust system will affect your engine’s performance depends on other modifications that are made.
Thunderheader ™ high-performance exhaust systems, are specifically designed for the HARLEY-DAVIDSON V-Twin engine.
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