My stock unsilenced air cleaner base measures 5.05" ID at its throat.
I'd rather not grind it larger if the AVS2 5.125" dimension is exact.
Maybe it's not, I don't have an AVS2 here to measure.
My base looks like it'll clear the AVS2 fuel inlet area, which appears a bit taller than my 4426S.
The goal is to have this look as stock/original as possible.

March2019Engine.jpg