Pierce Przybyla

Here to pick somebody's brain. I have a 1985 GS that needed an exhaust so I pulled one from a 1983 GS L part car that I have unfortunately the exhaust(downpipe to Muffler) is too short. Would swapping the exhaust manifold solve this problem? Or is there another answer that I'm just not seeing?

Maxwedge

iTrader: (1)

The (stock) manifolds are the same. Are you missing a CAT? Or the connecting pipe with the hangers on it?

Pierce Przybyla

No I'm not missing anything and the exhaust fit the 83 gsl perfectly not problems. When I put the down pipe on the angle is wrong and is too short.

diabolical1

iTrader: (3)

if you think swapping the manifolds will work, then why not? you have the parts right there.

it does sound odd though. i always thought the manifolds on the '83s were the same as the S3 12A cars.

Maxwedge

iTrader: (1)

Yeah, there's only 2 manifold types: The Thermal Reactor from the SA and then the Manifold on all the FB's.

Carl

iTrader: (2)

There are actually 2 different FB manifolds. The one in the picture above is more or less 84-85. The more-or-less 81-83 is similar, but the exit is longer and slightly different angle. The early one was preferred from a flow perspective for Spec7's. I have both sitting around somewhere.

Carl

Early FB

Late FB

Maxwedge

iTrader: (1)

Thank you Carl, I never knew.

diabolical1

iTrader: (3)

i had always suspected there were two different ones, but i thought the breakdown was 1981-82, then 1983-85. so i thank you for that tidbit as well.

Carl

iTrader: (2)

Looking at the diagrams in the parts manual, it appears that they shortened the manifold in 84 to make room for the third catalytic converter.

Carl