The manifold with the butterflies is at best, undesirable. The butterflies are for emissions purposes and it's inefficient even when the butterflies work. If the extra manifold is a similar one piece one with dual exhaust outlets but without the butterflies, it could be the best Volvo one and work well. Post a pic.
You might be able to find a body shop that is spraying a black car. A couple of black base coats and multiple clear coats should give it a long life. Mask the centre off before you take it in. Audi repair shop?
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