Does anyone have the exhaust restrictor that fits a stock 2006 WR450 muffler? I have been looking all over and had no luck finding one. I keep finding myself on steep trails with large loose rocks and wanted to try the restrictor to change the power just to see if it gets easer. I'm wearing myself out:ride: a lot steeper than it looks note drz400 stuck part way up. He had to slip the clutch a ton to get rolling each time.