List of things you'll need to get started:

Hose (in the appropriate size to match your brake ducts)
4X hose clamps
2X aluminum flanges (in the appropriate size to match your brake ducts)
8X countersunk #4x0.5" screws and matching nuts/washers (similar size screws work as well)
Hole saw (in the appropriate size to match your ducts)
A few 14" zip ties

Step 1: Bumper cutout

I'm going to begin the install after the front bumper is removed since there are numerous tutorials for that so far. Once that is completed, lay the bumper down (on a soft surface so you don't scratch it). Place the ducts face down inside the bumper and drill the pilot holes in your bumper using a 3/32" drill bit.

Brake Duct upside down on the front bumper

Using brake duct to match drill pilot holes

This is what the cut portion will look like when the pilot holes are drilled.

step 2: CUT BUMPER

I used the combination of a dremel, circular cutting tool, and tin snips to cut my bumper to fit my duct through. Cut it close to the pilot holes little by little by trying to fit the duct through. When you can slide it through the bumper so that it sits flush, then you're done with that side.

step 3: bolt brake ducts to the bumper

Sneak the ducts through the holes you cut and use the countersunk #4 screws to bolt them up. I put some touchup paint on my screw heads to make it blend in to my ducts.

The finished product. Looks better than stock in my opinion

step 4: Route hose

Please see our tutorial on routing and mounting the high temperature brake duct hose to finish the install!