I have searched and searched for high flow cats for my 95 2.2 Impreza. Now I really need one due to snapping off the O2 bung when I tried to change it. Would it just be easier to take the O2 bung and weld it on a piece of pipe for my own high flow cat?

I'm not sure what you're asking, but the easiest thing would be to bring your car to an exhaust shop and have them weld in a 02 sensor bung to replace the part you broke off.