Vance & Hines Q-Series Double Barrel for Harley Softail 86-10 A quieter standard, thats what the Q series is all about, plus theyre loaded with other features 100% blue-proof technology with 220 head pipe and muffler heat shields Proprietary Power Chamber technology for the right horsepower and torque gains all the way through the power band Slash-cut ends to finish off the look Made in the USA