Thanks to all on this site and the MINI GP Forum for their excellent dissertations on brake ducts for the GP. I've come up with a very easy variation of Ric's direct-thru-the-wheel well liner version.
The key is the hose. I found a black 2-1/2" ID, high-temp, wire-wound flex hose at a local industrial supplier: KANAFLEX 620-WD EPDM @ $5.54 per foot. You'll need a couple of feet. Remove the bumper cover as described on NAM, the Bentley manual, etc. Carefully remove the ducts using a thin blade prying on the detents. Using a 3-inch hole saw in a variable speed drill, carefully cut holes from the back side of the bumper cover in the centers of the black supports for the ducts that currently block off the air.
Using the same 3-inch hole saw, you should be able to carefully drill a hole from the front side through the wheel well liner directly behind where the ducts will be....without removing the front wheels! I drilled a 1/4 inch pilot hole exactly where I wanted the center to be thereby allowing the hole saw to be right on target. Be sure to not drill near the well fasteners.
Now, re-install the bumper cover. Then twist the rubber tubing onto the back of one of the ducts. You'll be amazed at the holding power. I used one-inch wide strips of duct tape for extra measure. Measure and cut the tubing you'll need to go from the back side of the duct, through the hole in the wheel well liner with at least 1 inch protruding through the hole. Remember, you can always cut off excess if it's too long a lot easier than if it's too short. You'll need a good pair of wire snips to cut the wire in the tubing.
Now, simply insert the tubing/duct assembly through the bumper cover and the wheel well liner, then snap the duct detents into place. Do the other side, then check to be sure that the protruding ducts don't touch the front tires. You're done!

 

Do you have any pictures that you can share?

 

Sadly, didn't think to take any while doing the job but when I do the other GP, I'll be sure to take some. I can post a pic of the tubing, a front view and what the wheel well opening with the protruding hose looks like.

 

It would be nice to see a picture of the wheel well where you have the tubing exiting toward the brake. I have the front hole cut out and the bumper cut but have been trying to decide how to route a hose with missing moving suspension parts and the crank pulley.

 

Here are pics of the left and rt. wheel wells showing the tubing exit. It is located such that the airflow is just inboard of the inner edge of the front tire when the wheel is pointed straight ahead. I've checked to be sure that the tires don't hit the tubing by turning the steering wheel lock-to-lock. Hope this helps. I'll take others when I do the other GP.

 

Just finished doing the other GP and took a few more pics. Hope they'll help show how EZ this is. You don't even need to remove the front wheels. With the bumper cover removed, carefully remove the ducts and twist on approx. 8 inches of the black 2-1/2 flex. hose. Then, using your 3 inch hole saw, cut the 3 inch holes in the back of the black plastic on the backside of the bumper cover. After re-attaching the bumper cover, drill 1/4 inch pilot holes in the wheel well covers straight behind where the ducts go. You should be able to use a portable drill from the front side. Then drill the 3 inch holes in the same way from the front side. Insert the duct/hose assemblies and snap into place. You're done!

 

Thanks for the photos.

 

You really need to duct that hose right to the rotor to get anything out of it guy's. Ideally you want to go to the center of the rotor but that is impossible...

https://www.northamericanmotoring.co...-needed-3.html

My install starts at post #75..

Remember - the rotor cools the pad.

 

S-Driver, I certainly agree with you. However, in the last 5 years, I've put thousands of track miles on my '05 MCS running mostly at VIR and CMP in the Instructor Group. Using Hawk DTC60's on standard calipers and only 2 inch ducts thru the fog lamp holes routed just like these on the GP's, I have never lost my brakes (and I'm not out sight-seeing!) The procedure I've outlined is a relatively simple and inexpensive one for GP owners to get cool air into the front wheel wells.

 

interesting.