Kuryakyn 9155 Torque Cone Straight pipes sound sweet, but for street use they&#39;re a performance disaster! Here&#39;s an inexpensive way to get back some of that lost horsepower and gas mileage without affecting the sound.Fits most 1-3/4" O.D. Twin Cam, Evolution Big Twin and XL exhaust systems.Sold as a pair.Note: Kuryakyn part number: 9155.