Port n Polish Qs

Go in small increments. As much as you want to just jump in there and start hogging things out, measure it up first. Remember....measure twice, cut once. Shaping the plenum is just as important (if not more so) than enlarging it. Open it up to match the size of your larger throttle body (I’m hoping you’re at least doing that as well...otherwise there’s not a lot of point), but concentrate more on making the air flow as smoothly and with as little turbulence as possible through the unit. You should be remeasuring to make sure things are progressing evenly every time you take any significant amount of material from the unit.