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Do you know if the driver's side manifold is the same for the Excursion? I was just under mine and it just looks like there is less of a bend to get in with the threads. Maybe it will look a bit different in the daylight. Any X owners with pics?
For those of you who haven't drilled the manifold, it's surprisingly easy to drill and tap.
I recommend starting a pilot hole with a very small drill, using plenty of oil as a lube for the bit. Then drill the hole for the tap. It's a lot easier to start a tiny hole in metal and increase bit size than to go at it with the big drill bit without a pilot hole.
Buy new drill bits for the job and a new tap. There is no substitute for a nice sharp cutting edge, whether it be the drill bit or the tap the cuts the threads.
Should you be concerned with the metal shavings left in the manifold after drilling. Doesn't it go to the turbo? Just a little scared about the shaving going though my turbo.