If you want to be competitive wagler heads are a must. New process on castings put 3000 psi on materialas its being cast. Jeremy is on the front edge of high horsepower engines. You don t get there without thinking outside the box. Sometimes it doesen t go as planned, but he has always helped and tries to make it right. Kuesliak runs his motor in cummins killer. One of the best running duramax in country. Nuff said.