07-16 HARLEY FLHX2: Magnaflow Pro Duals Headers (Chrome) MagnaFlow delivers revolutionary style, performance and engineering in one innovative design. Pro-Duals offer state-of-the-art tuned length head pipes for improved, equal flow exhaust that helps generate power to the ground with an enhanced feel on the throttle. Pro-Duals feature MagnaFlow's exclusive non-bluing, Magna-Black coated, stainless steel, 1-3/4" head pipes that reduce heat on the rider's leg. Pro-Dual head pipes are ideal for tuned engines requiring better flow or stock engines looking for improved output. 12 mm and 18 mm O2 sensor ports allow for maximum tuning options.