I had a small rock ding in the headpipe on my 450 from a rock thrown up by my front wheel. I used Motoman's head pipe fix method on the titanium header on my 450. You can find it on his website listed below. http://motoman393.thumpertalk.com/ It worked like a charm! I couldn't believe it was that easy. Also, with the titanium pipe, a propane torch works fine. No need to use Oxy/Acetylene. Makes it even easier. The only issue was finding the correct tap. The correct tap is 1/4 NPT and you use a 7/16 inch drill bit for the hole to tap. When you are done, use some WD-40 and a green ScotchBrite pad and shine that header up. It removes the torch marks and makes it look brand new!