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Old 11-16-2008, 03:08 AM
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Join Date: Sep 2008
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How to Re-Use the 4.8 Rear Flares with Running Boards

If you have a 4.8 and want to install the aluminum running board kit, normally you have to buy the rear flares that work with the running board kit. This normally adds $400-$500 in cost. Then, if you want the front flares too that will add another $400-$500. So, that adds up to $800-$1000 more that you have to spend over the cost of the Aluminum Running Board Kit ($500-$600). I'm going to show you how to re-use the rear flares so all you need to buy is just the running board kit - just like 3.0 & 4.4 owners!

I will not go over how to remove them. The running board kit will have instructions on how to remove all the wheel arches. All that's entailed is removing some plastic rivets.

So, here's what it will look like when you remove it. Notice the 6 metal clips that hold the flare to the wheel arch.

Remove the 6 metal clips. I used a small flathead screwdriver to pop them out (in the pic is a pointed one but the flathead is better). Insert the screwdriver into the side slots (looks like this > or <) and carefully pry the clips open to remove them. Separate the flare from the wheel arch.

Next make a stencil that will mark the location of the slots. You will need to make slots in the rear wheel arches that come with the running board kit. Then you can attach your old flares to it. Lay down the old flare on some cardboard paper. Traced the outside first to get the shape. Then keep cutting it until the stencil fits INSIDE the wheel arch. When its close to the proper fit, lay the cardboard inside and pressed it down until it makes creases on the edges - easy way to get the shape. My cardboard wasn't big enough so I had to make it out of 2 pieces then taped them together. You don't need an EXACT match. You only need to make sure that if fits inside BUT not move around. I used the pointed end section as my starting point and then kept fitting it inside from there. Once finished tape the stencil to the inside of the your old wheel arch. You only need to tape it near where there are slots. Turn it over so you can see the slots and use an exacto knife to cut slot openings into the stencil.

Afterwards, remove the stencil from your old wheel arch. Attach it, with tape, to the INSIDE of the matching rear wheel arch from your running board kit. Then use something to trace the slot opening onto the new wheel arch. I used a pointy screwdriver and scored the outline. Now take an exacto knife and cut the slot openings on the new wheel arch. The plastic is not very thick and soft enough. I started drilling it out but the exacto knife was faster.

Take the flare and attach it to your new wheel arch. Now push in those metal clips and you're all done! Make sure when you attach the flare that it fits flush on the bottom (side towards the tire) and outside (side where the flare attaches). My slots turned out to be too low at first so the flare was sitting too low. So, I just cut the slots bigger on the top side only - so the flare would fit higher and be flush on the bottom. The slots don't have to be perfect. The corners of the metal clips keep it from moving in all directions. Here's the final assembly with the clips on.

If you want running boards and rear flares only, buy this:
Aluminum Running Board Kit = Part 51710017315 ($499 at BMW of Bloomfield, NJ)
Then re-use the rear flares as shown above.

If you want running boards, rear flares & front flares, buy these:
Aluminum Running Board Kit = Part 51710017315 ($499 at BMW of Bloomfield, NJ)
Front/Left Wheel Arch with flare = 51717051037 ($200 at BMW of Bloomfield, NJ)
Front/Right Wheel Arch with flare = 51717051038 ($200 at BMW of Bloomfield, NJ)
Then re-use the rear flares as shown above.

Hope this helps and Good luck!
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