I machined the base plate adapter from a piece of 1 ¾ 6061 plate. This is probably overkill, but it is very solid and does a good job of reinforcing the cast filter base.





Not much drama during the mill work, other than a ton of shavings. Getting the internal openings cored out was a little tricky. I cut the first side of the core 1 1/4” deep.










Then I flipped it over and finished the throttle body openings.