Took about 1:20 to do. I don't have the right bore size grinders for this aspect so I'll order those in instead of using the smaller ones I have now. Prolly a one hour job per inlet with the right diameter tools.

But my secondary (WOT) air inlets should be MUCH MUCH more efficient and flow GOBS more air with all ports done this way.

Good thing this one finished as I'm bushed. My hands are shaking. Better hydrate and lie down awhile.

Hint: Don't attempt this work in a white cotton terry bathrobe. Can you say "BLACK!?!" I knew ya could. No wonder you shouldn't breathe this stuff.