HMF 411223686071 Penland Pro Exhaust: Arctic Cat 400/500/650/700/1000 Fits: 06-14 Slip On Round Spring mounts Turn-Down-Brushed End Cap INCREASED TORQUE: The Torque Range Modifier adds more bottom-end torque for rough conditions. 4-6 dB INCREASE: Depending on the model, you can expect a 4-6 dB increase over stock. UNRESTRICTED CORE: The Penland Pro uses a 2 1/8 non-restrictive core for maximum flow.