90+ Exhaust Manifold
Here are pictures of the 90+ exhaust manifold I purchased from Performance Turbo
Specialties. The manifold has round runners and better flow direction where
the runners come together. The manifold is usually connected to a Mitsubishi
turbocharger with 8 mm studs. To connect to the Garrett T3, the opening
is enlarged to match the T3 and the studs are upgraded to 10 mm (requires enlarged
holes on turbo exhaust housing). My exhaust housing is flat faced and does
not have the Volvo flange so the manifold was machined flat to match. I
used a gasket from a mid 80's Saab 900 Turbo on the mating surfaces to insure
a good seal. To better support the manifold, I added a support bracket at the
bottom of the manifold on the flange that mounts to the block. There are
two blank bosses that I drilled and tapped with 8 mm threads to attach the bracket.
Note: The manifold and the turbo exhaust housing have been coated with
Techline Black
Satin thermal coating in these pictures. I have recently had the manifold coated
with Jet Hot.