I just purchased a cherry 2003 400EX and took it out for its maiden voyage to Sand Mountain Nevada. It developed a little exhaust leak. See pic. It has a Big Gun exhaust that was purchased when the bike rolled off the showroom floor. I believe the header is aftermarket and assume it’s also a Big Gun but I’m not certain. I don’t really want to add a complete exhaust for $600 so I’m hoping to replace just the header. Any suggestions?