It is for the cataltic converter bypass. I was wondering how do i put this thing on? It looks like the oil pan drain plug

Well first you need to remove the O2 sensor that is located after your Catalytic converter.
Then use it to plug the hole.
Of course this is for those who are brave enough to remove the Catalytic converter in order to gain about 10 hp.

Oh and you will also require an O2 spoof to plug into the recepticle when you unplug the O2 sensor and trash it with the CAT.

When I did mine, I couldn't buy just one plug. I had to buy a dozen of them, so had some left over.

There is no O2 after the cat on a 93, don't spend time looking!

the mecahnic said showed me 2 O2 sensors on mine.

i only have 1 o2 sensor

Then you're lucky Kenn. The rear O2 sensors were added by GM on later models to detect faulty Catalytic converters.
All you have to do for 10 free hp is remove the Cat and install a spool piece.
Your supercharger will love it and the sound difference alone is worth it.
Make it removeable, so you can re-install it for the pollution checks.

can you do this on a 94?

You can remove your cat on any year... it'* just really illegal and highly poluting. Why not go hi-flo? :?

Yes, you can do it on your '94 or any car for that matter.

Steve, you have only one. Your mechanic is wrong.