I have a 96 Civic DX Hatch Back with a 96 GSR B18C1 swap and a Tanabe Racing Medalion Full Cat Back Exhaust. I just want to know what header will have the best chances of bolting up to the factory catalitic converter. I figgure that it would either be 96 VTEC GSR B18C1, or the 99 VTEC Civic SI Header...But it may very well be something that would fit. And I am almost sure that all B series exhaust headers bolt up to the engine with no problem. let me know what everyone else has done.