Mystery Downpipe

Kevin87TurboT

How many can I own??
Hey Guys,
I recently purchased a turbo Buick that had this downpipe in the trunk. The owner couldn't tell me much about it. Who manufactured this one? :confused: It's a nice looking piece, but I'm not sure how the wastegate could have worked on one of our cars...unless there was a header package that had the mating wastegate flange. Any ideas?
Thanks.
Kevin
 

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It looks like it has an old TO4 flange on it and that it had an external gate on the exhaust housing that connected to the small pipe. It could be modded to fit a TO3 style housing but it would be hard to use with anything but an external gate. Fwiw not to many in the TR community run the TO4 ex housing. They run the TO3 internal (stock type) or a tangential 4 bolt style housing that requires a v-band clamp.
 
Looking at my old ATR catalog from the early 90s, it looks very similar to their on-center series stainless 3" downpipe. It says it's made to fit 60-1, 62-1, and 67-1 'on-center' turbos and uses an HKS wastegate.
 
Looking at my old ATR catalog from the early 90s, it looks very similar to their on-center series stainless 3" downpipe. It says it's made to fit 60-1, 62-1, and 67-1 'on-center' turbos and uses an HKS wastegate.

Yeah, that sounds correct.
 
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