I ripped out my AC today. While doing that i decided to do away with those heat shields on the manifold and downpipe and i came across what i guess is a catalytic converter right there in the front. I never had a car with a cat right on the downpipe and was wondering how can i eliminate that? I am guessing a header would do away with it. if so where is the cheapest one i could get and does that connect the same place at the bottom where the cat mught be otherwise? Because i think my Si had its cat under the car.

Thanks