Ramjet's has been selling Thunderheaders for nearly 30 years! Shortly after being introduced to the market in the late 80's, Thunderheader 2:1 exhaust systems became THE performance exhaust system for your Harley-Davidson. Between the unmistakable Thunderheader sound to its seat of the pants, dyno proven performance gains, and its iconic look, a Thunderheader is always an excellent choice!
Thunderheader head pipes are tuned to the proper length and diameter to produce maximum horsepower and an excellent torque curve. With a patented collector design, only Thunderheader systems can produce their power, torque and sound. The collector directs spent gases through acoustical dampening chambers, which creates a spiral motion upon exiting the pipes. This also creates an anti-reversion trap to minimize the amount of air rushing back in.
- Commonly Recognized As The BEST Sounding Exhaust For Harley-Davidson
- Proven & Noticeable Performance Gains
- Available In Black or Chrome
- Heat Shields Available Separately
- Classic / Performance Look
- 100% MADE IN THE USA
FITS:
91' - 98' Dyna (With Mids & Forwards)
99' - 05' Dyna (With Mids & Forwards)
06' - 17' Dyna (With Mids & Forwards)
***Ramjet Thunderheader Brackets are highly recommended over the stock bracket. Available here:
https://www.ramjetracing.com/products/ramjet-99-05-dyna-thunderheader-bracket?variant=23130339377200
NOTE: 12' - 17' Dyna models running a Thundermax ECM or aftermarket tuner that uses 18mm O2 sensors will need to use the 06' - 11' Dyna Thunderheader.
NOTE: THUNDERHEADER BOXES ARE LARGE AND SHIP GROUND PLEASE ALLOW 1-3 WEEKS FOR DELIVERY
DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES.
IF FOR RACE OR OFF HIGHWAY USE OUR CA EXHAUST WAIVER WILL NEED TO BE SIGNED AND RETURNED PRIOR TO SHIPPING.
CALIFORNIA CARB WAIVER AVAILABLE HERE:
https://cdn.shopify.com/s/files/1/0157/0363/8064/files/CA_CARB_Waiver.pdf?573