b18 gsr question? Is the bolt pattern the same on a gsr as a ls header?

I bought a cgsr but i think the 4 into 1 dc header i got is for a ls or can the headers be swaped out with no problem?

 

bolt pattern for the head is the same for all bseries. the difference is where it meets the cat. you will need a different length cat if your gsr is a 94-99(longer cat o2 bung on the inlet pipe of the cat) . if your gsr is a 00-01 (shorter cat 02 bung near the collector of the header) then the header should bolt right in.

 

yep i found out that the only difference is the b16 headers should sit 1/3 in taller and they all should bolt up.

Mine is a 94 how much slack, or space will needed to be added to get the cat bolted to the header?

 

if the header is from a 94-01 ls then the cats total length i believe should be around 12 inches