I just installed twin slash staggd's on my 2009 c50. Everything fit perfect except where the header pipe goes into the exhaust port. The flange on the pipe that goes into the port is about 1/4" deeper than the stock pipes which keeps the bracket from seating flush against the outside of the port. Almost like V&H forgot to allow space for the gasket. I tightened down the bolts and there doesn't seem to be any leakage from the port. Has anyone else had the same problem? Is it OK to run the bike like this? I have contacted V&H and am still waiting on a response.