I have a 92 Civic EG6 SiR with a B16A. It still has the oem cat. Will a header from a GSR bolt up to the collector or will I need an adapter made up? I ask cause I heard the cat on a JDM civic is a different length.

 

Any b series will work, who cares about the length, just hit up a muffler shop. I'd source out a B16 header as they are in most cases shorter due to the block height and hug up close to the oil pan giving you better ground clearance.

 

the gsr header will bolt up but i think the piping is short so youll have to go to a muffler shop and they will have to weld extra piping to the cat so it will connect to the collector

 

a gsr header wont bolt up to a b16 head

 

What an educated man you must be.....

Bolt patterns for the exhaust manifolds on b series heads are identical!!

 

GS-Rs use a different bolt pattern for the intake manifold, but the exhaust manifolds are all the same, at least as far at the bolt pattern. A header designed for a Del Sol Vtec or '99 - '00 Civic SiR should bolt up perfectly.