Mercadore

So I have been looking around for headers to my C230k M111.975.

Only problem is I cannot find a good one for under 500USD or so for my car.

I can get one for about 700USD custom made here in Sweden, but I am looking at some alternatives, which many makes me question the designs they have on these aftermarket "performance" headers.
Here are some of them:

Manzo Header


Looks like the same design as Manzo


Also this looks the same.

And I can't find any other designs except the one available from Dynocomp that looks like the REAL DEAL:


I know it is probably super dumb to cheap out on a header but does anyone, I MEAN ANYONE, have any knowledge about these cheaper headers and do they provide ANYTHING in performance or sound over the stock one?