Experience a powerful combination of increased horsepower, torque, and the unmistakable Thunderheader sound with the Thundercone Slip-On Mufflers.

What sets the Thundercone slip-ons apart are their innovative design featuring a patented collector instead of a conventional baffle. The collector works by efficiently directing spent gases through four acoustical dampening chambers, optimizing the exhaust flow for maximum performance gains.

To further enhance the exhaust dynamics, the Thundercone mufflers incorporate a cutting-edge flow director. This multi-tasking component not only guides the outgoing flow through the acoustical dampening chambers, creating a spiral motion upon exiting to the atmosphere but also forms a pyramidal-shaped anti-reversion trap. By doing so, it minimizes the amount of air rushing into the system, allowing for optimal performance.

Working hand-in-hand with the flow director, an integrated diffuser shroud is built into the reverse cone. This patented feature diffuses the air rushing in when the pressure inside the system becomes equal to the atmosphere. This ensures smooth airflow and minimizes disruptions, leading to improved overall performance.

Unlock the full potential of your Harley motorcycle today and experience the unrivaled performance and sound that Thunderheader is renowned for. Order your Thunderheader Thundercone Slip-On Mufflers now and give your Harley the exhaust it deserves!

Note:

Not all products are legal for sale or use on pollution controlled vehicles. Check your local laws and the manufacturers information

There is no warranty on exhaust pipes and mufflers with regard to any discoloration. Discoloration (bluing) is the result of tuning characteristics, cam timing, carburetor jetting, overheating, etc., and is not caused by defective manufacturing. See the CHEMS/LUBES section for products that will help prevent or remove bluing.

Installation of a new exhaust system may change your motorcycles fuel-air mixture requirements. Please consult the exhaust manufacturer directly with questions regarding any modifications that may need to be made during, or after, installing their product. If a jet kit or fuel processor is recommended, see the FUEL/INTAKE section

The Air Resources Board (ARB) does not permit the use of aftermarket emission-related parts that alter the air/fuel ratio of an emission-controlled vehicle. Due to these legal restrictions this part cannot be shipped to California.

(2) Black steel slip on mufflers

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The Air Resources Board (ARB) does not permit the use of aftermarket emission-related parts that alter the air/fuel ratio of an emission-controlled vehicle. Due to these legal restrictions this part cannot be shipped to California.