Well Jeff's DIY was pretty great. It took me about 2 hour with a lot of goofing off. The only thing I did different was to also loosten the rear exhaust mount (the one closer to the engine) on the left side. This loweres the exhaust about an inch and it was easier to get the wire in the hole. The I put the exhaust back up before putting the plates in.

I found a 3 prong wire running with the antenna wire. Anyone know what it's for? Do I have the right antenna wire? It is the only one I found down there but I must say I did not see a real increase in signal strength.

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2005 X5 4.4
Sold but not forgoten