My gsr header has a crack on the top part. Are oem LS upper headers interchangeable with oem GSR upper headers? Reason being is there are a ton of LS headers at the junkyard but no GSR.

 

A LS header is 4-1, and a GSR header is 4-2-1. So just trading the top, wouldn't work. Correct me if I'm wrong.

 

Uhm i'm pretty sure Ls headers are 4-2-1 also. Only OEM headers that i know off that are 4-1 are the JDM ITR headers.

 

You're wrong.


OP: You should probably try to find a complete header. Separating the top piece and the bottom piece of the 10+ year old header is going to be a huge pain in the ***. Getting them back together could potentially cause leaks as well...

 

91 ls's are 4-1 92+ are 4-2-1

 

X2.. Jsut get new headers. might spend a chunk of change but its worth it in the long run,