Hey guys I have an 2008 WR450F. All YZ type free mods performed. Stock head pipe but a GYRT muffler. Has anybody tried running the 2006-2009 YZ450F exhaust systems on these bikes? I have noticed the YZ has a larger diameter head pipe than the WR. *I have a new FMF 2006-2009 YZ450F muffler but the mid pipe will not fit the WR450 head pipe, even if using the WR mid to head pipe gasket.