THUNDERHEADER EXHAUST - M8 SOFTAILNEW X SERIES THUNDERHEADERS Ramjet's has been selling Thunderheaders for nearly 30 years! Shortly after being introduced to the market in the late '80s, 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