I noticed the same "bump" in both my exhaust mani's... - Saab 900 Bulletin Board - Saabnet.com
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and I'm pretty sure they put it there for a reason. The Volvo T3 flanged exhaust mani they came out with in 90+ models of Redblock, have a very interesting casting right under the T3 flange where the turbo mounts. I'm thinking it was referred to as a "goilet" but let me check that....
The Volvo manifold brings all four runners to the center, unlike the SAAB version which carries it all forward.
Here is a pic of the "goilet" area of a Volvo 2.3L collector:
http://www.pbase.com/stealthfti/image/26841565
The author of those pages explains the purpose....most likely the same as our beloved SAABs.
_______________________________________
DET17
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