hey guys,

we install quite a bit of o2 bungs before the tuning process, some setups have nice stainless and other have mild steel exhaust.
our bits work great on mild steel, however, we simply cut a quick hole with the plasma for the stainless.
what drill bit are you guys using to drill through stainless? and how long are they lasting?
mine don't seem to last very long.

i buy decent and cheap bits and the better ones obviously cut better.
what's the best and strongest, longest lasting drill bit available?

i also bought a kit of those Rotobroach bits, pricey for four of them, they worked great at first, but the stainless killed them.