Using our own CNC Milling machine we helical interpolate a new thread into the exhaust port to accept one of our CNC MACHINED. The new thread is then CNC milled inside to fit the new rose nut exactly. Because of the nature of CNC machining the external and internal threads are machined coincidentaly(both thread starting in the same position with one thread inside the other) giving a very strong insert. Inserts are threaded and locked in and WILL NOT jack out. We can weld the port to fill in any poor attempts at previous repairs. (please note this can be charged as an extra). Also any remedial welding where poor…