i called up dc and the headers i was looking at they told me it was 2.25" and the stock cat is 2" i believe? and the rest of my piping is going to be 2.36. so from 2.25" - 2" - 2.36" that'll work?
im going to look for a magnaflow cat thats same size as stock, because i cant afford the stock cat right now. and it can just be welded on. ill use the old flanges with the gaskets and springs. and , i belive you, so the stock cat being 2" doesnt rob performance? or have a bottle neck effect.. big headers, stock cat, then big catback..