IIRC, the different headers to get would come from: supersprint, kleemann, evosport, and the latest addition is LET (i think its a VRP piece). I could be wrong but renntech, brabus, carlsson could also provide headers. There are probably more, of which are probably even more expensive.

If the XF community knows of other manufacturers who are willing to create headers for the m112 at an even better price point than those listed above, then im sure there would be MB m112 owners who would be interested at long as the headers would be applicable.

IIRC, evosport had a day long sale for the m112 equal length headers before new years, but it was still about a grand.