HMF Polaris Sportsman 850 XP 2012 - 2015 Titan XL Slip On Exhaust + EFI + KN For the riders out there craving maximum horse power with maximum volume, the Titan-XL features an unrestricted internal core design that produces maximum horse power at an incredibly loud volume. The 5" inch diameter exhaust shells house an internal exhaust core that creates maximum airflow. Increased Horse Power and Torque Withstands Extreme Temperatures Two Year Warranty: HMF Engineering Inc. warranties all exhaust systems for two years from the date of purchase for all manufacturing defects.