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what exhaust manifold is this? never seen one

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That's an old Evo VIII/IX Buschur Racing cast manifold for DSM flanged turbos (old FP3065 comes to mind). These were available before turbo advancement had taken off for the Evo platform (they always looked kinda poofy to me). Not sure if this would keep the turbo in the right position, let alone work with our 4G63 as it wasn't designed for us.
 
It's not an Evo 3 manifold. Like Demon said, its a Buschur cast manifold meant for running a DSM flange turbo on a later Evo.

DSM/Evo3 manifolds
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Buschur DSM-Evo manifold
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So would this fit/work on our 4g63? I have a 92 gvr4 and the guy said he'd sell it for 75
 
I highly doubt it would work. You'll run into fitment issues all over the place, especially in the O2 housing area.

2g manifolds are a dime a dozen, less prone to cracking, and a port job away from being an Evo 3 manifold.
 
That thing would never fit. Look at the way it offsets the turbo to the driverside of the car vs offsetting the turbo to the passenger side like a DSM manifold does. Look at a pic of a DSM manifold- the bolt holes for the turbine housing are basically set around the #3 runner on the DSM, whereas the holes are set around the #2 runner on this other one. Huge difference.
 
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