94 was a transition year for Mitsubishi, so you might want to verify that there isnt a downstream (after the cat) o2 sensor. The years prior didnt.

I personally think the 3.0 SOHC doesn't sound good opened up. Nobody will be impressed and you will increase cabin drone. If you want a quick way to see if you like it, you could aways fab up a test tube and see if that makes you happy.