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All THUNDERHEADER™ Exhaust Systems are legal for CLOSED-COURSE COMPETITION use only. Thunderheader™ high-performance exhaust systems, are specifically designed for the HARLEY-DAVIDSON V-Twin engine. How a Thunderheader™ exhaust system will affect your engine’s performance depends on other modifications that are made. 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). For motorcycles used only for racing, other modications can be considered. If your engine is equipped with at least a high performance cam & air cleaner, your performance gains will be significant. A stock cam & air cleaner will limit the performance of your engine, even with a high performance exhaust system installed.

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