The Honda Rancher 420: IRS is available as a Full System in the Performance, Titan, and Swamp Series. The Performance Series picked up nearly 4 horsepower with nearly 3lb of torque. The Titan-QS, and Swamp Series picked up 2 horsepower with 2lb of torque, and the Titan-XL, and Swamp Series picked up 3 horsepower with 3lb of torque. At idle, the Performance, Titan-XL, and Swamp-XL are 2-4 dB louder than the stock muffler, while the Titan-QS and Swamp are only 1-2dB. The HMF Quiet Core can drop the volume roughly 1-2 dB more.