Does anyone happen to know the K&N part numbers for the valve and crankcase breather filters?  Their website isn't returning a result and I'd prefer to avoid freight when lots of shops sell K&N.

For catch cans, are there any specific suggestions for a L28 with Webers?

Found them.

K&N 62-1340 is the 5/8"
K&N 62-1370 is the 1"

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I did the ITG air filter and ran all the vents to the air cleaner like the original configuration.

I'm not a fan of sending dirty air from the engine back into the engine so consider a knockout catch can with a drain valve.

Here's what the little K&N look like. No emissions testing where I live.

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