i havnt done much looking but im guessing there isnt much in the area of aftermarket exhaust manifolds, if there is id like if sombody can direct me towards it. otherwise i was wondering if i could port the manifold and ceramic coat it if i would see any worthy gains, thinking about extrude honing too but i kno that could be pricey. lmk what you guys think.. thanks

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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)