I removed my stock muffler and resonator and installed an Aeroturbine 4040xl and a curved turn down tip. Was just trying to free up the whole "exhale" procedure. Also added a PSM intake to it. The PSM system let me keep the stock filter and box only putting a hole in the bottom of the intake box to attach the tube. The tube drops in down alongside the fender liner and lets more cool air into the box than from the fender. It does not pick up any water or snow. Only leaves and bugs. If you are a little bit of a engineer, you can do it with hardware store parts for a lot less money. I don't know if this stuff hurt or helped anything, as my gauges were added at this same time.