Hey,
I just bought a beautiful '82 GSL and was wondering about the exhaust systems, I own an '85 GSL with full RB exhaust, and am hoping to just switch it into the '82 (with muffler shop fabricated exhaust from the manifold back) and vice versa, is this possible? I would assume so, but on the RB site, you have to choose between a '81-'83 12a header, and the '84-'85 12a header, are they interchangeable?

Thanks

 

The header for the '84-'85 isn't for a 12A but for the fuel injected 13B that comes in the '84-'85 only GSL-SE model.

 

If your 85 is a GSL,then its the same 12A engine as the 82.It should bolt right up.I believe the difference in the RB headers is just a hanger mount having to do with the tranny crossmember.
The main difference in factory exhaust systems between the early and late FB's,is the dual midpipes on the 81-82's.They still follow the same path though,and the unibodies are the same.

 

i put my full rb exaust off my 85 into my 79 and it bolted up flawlessly.