i have a B18C1 in a 94 civic hatch and i was wondering if there is a specific combination of a exhaust manifold and catalytic convertor that i can use so i can buy an cat-back exhaust without having to modify the exhaust piping.

 

 

If you use a stock 99-00 si manifold and downpipe with the gsr cat, it will work without mods (i have both if you want them . The guy i bought my hatch off of had that setup.