Just buy a muffler and header (yzf 2005- like the old exhaust cap) for my wrr. Some guys ride this exhaust already: what have you done to make the exhaust fits? Will the header fit with the oem muffler (with an other gasket?) ? Fits the oem header with the yzf muffler? Dont want to cut the mufflerpipe, maybe could drill only little metalplates for the mufflerpipe-bolt?!