I've developed a rather larger exhaust leak at the end of the header pipe, where it connects to the silencer. Bike: YZ400f Bought the bike with white bros silencer slip on, but it looks like previous owner used a non stock header, and some sort of tape to seal the two together. Well, the tape has now worn out, and there is nearly a half centimeter gap in the space where the two slip together. Any suggestions on how to properly seal this? It looks like the header and silencer are two totally difference sizes. i've looked for some good seal tape, but haven't found anything more that a few hundredths of an inch thick.