So I recently picked up a Spoon N1 DC2 Gen. 2 to install on my 94 Integra which has a stock JDM B18C GSR Motor and Exhaust setup, the previous owner it looks like had the exhaust wielded onto the b-pipe. I'm going to have to have it cut and a flange wielded on so I could bolt on the Spoon N1, My question is do I need to source a 2.25" or 2.5" male flange and where could I get one.