I agree with the above post. I just used a vacuum, after breaking a socket trying to loosen up the turbo bolts. Used some grease on the tap and never looked back. Some other folks on here leave the truck running while drilling so as to blow any of the shavings out, but I didn' t feel comfortable doing that. Good Luck, and once you finish, you'll be glad that you did it yourself. Just a word to the wise, you would want to use a 1/8 NPT probe, just in case you mess up on the first drill/tap sequence, then you could always go up in size to the 1/4 NPT probe. Just in case. James