HMF Racing Polaris Outlaw 500- Competition-Series Full System 06-07The Polaris Outlaw 500 is available as a Slip On or Full System in the Performance and Competition Series. The Slip On System picks up 10 15% more horse power throughout the power curve, while the Full System sees 15 25% more. The Performance is roughly 4 6dB louder than the stock muffler, however the Cometition Inserts and HMF Quiet Core and lower that 2 4dB. Additionally, the aluminum shell and stainless head pipe weighs substantially less than the