I've always believed that a little human elbow grease never hurts. Even though the 2JZ-GTE comes from the factory very stout, it's still a production motor coming off an assembly line and still may have little flaws. Match porting and polishing the exhaut tracts is just a solution to cleaning up the head. Extrude Hone is pretty cool. If you can, please take some pics when you get your head back. BTW, how much did it set you back?