Hi Daniel,
You'll like the EDR-103, very nice unit. I didn't do any hole for the idle adjust, was bad enough having to drill a hole for the needle valve and a vent area in the bottom but then the real one had a vent opening. Never really had a problem with the idle adjust once it was set but if I need to I'll adjust with the cowl off and see what happens with some runups. Worth the wait on the cub, I ordered mine in December and got it in july. Keep us posted.

Bud