Introducing our new T-Man Custom M8 Head Breathers. These breathers are the third component of our new M8 breathing system. It was developed to help ensure a positive seal on the head breathers, while also providing twice the volume area than the stock breather that comes with your Harley-Davidson. It also has a double o-ring seal to prevent leakage between the head and the breather porthole. We have seen this product help with blow-by on motors when installed, although it is not a solution for oil blow-by issues. This system will also enhance your higher compression and big bore motors.