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They probably port match the exhaust housings on the turbos to the manifolds!
 

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They might cut back the turbine blades for extra flow - enlarge the wastegate port flap valve and hole. A lot of small tweeks can be done to turbos. I had a an old Mitsubishi VR4 Group A rally turbo years ago that had the compressor housing gas flowed.

TBH - it makes only small % improvement - the most important bit is having the right compressor and turbine wheels.
 
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