i noticed that people have a different looking manifold on theyre 617s and i was wondering here you got it or what car it came off of and what kinda gains would be expected from it?

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1985 mercedes benz 300D turbo diesel
1998 VW GTI VR6
1996 VW GTI 2.0
1999 saab 9-3 turbo
1987 300sdl (sold)