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It makes shavings, not just powder (most folks that have drilled their manifolds witnessed this themselves). Yes, it is very big deal, as the exhaust turbine is what is on the other end of the exhaust manifold. That little turbine is spinning several times your engine speed, even when cold and...

If you start up the truck and then start drilling and tapping, nothing is hot. When you finish, things will be warm, but this time of year, it feels good. Magnetizing the drill bit will still cause chips to end up in the exhausting impeller and do small damage.