is there a difference between stock gsr header and stock ls header???

 

i forget what years the gsr header is longer (i think 99-01)but other than that,no..

 

The OBD-1 Gs-R manifold and down-pipe is slightly shorter than the OBD-1 Ls manifold and down-pipe. My brother installed a 94 Gs-R manifold and down-pipe on his 91' 4door with slight modifications to the down-pipe, cross-member, and we welded a bung in for the O2 to be on the bottom instead of the top on the manifold.