As the title suggest I'm wondering if you can simply swap in the M exhaust manifold that BMW created for the S63 engine in the X5M and X6M? I'm pretty sure it will bolt on to the engine just fine as the block is the same but BMW also changed the turbos and I don't know if the housing is different. Perhaps someone on here with more knowledge can clear this up. As for what I'm hoping to achieve well it would help reduce lag and provide a more linear power curve but I don't think it would make that big of a difference in the short term. Only by putting on larger turbos and upping the boost significantly will it really be worth it. Reason I'm looking at it now is I'm having doubts about getting the dinan flash if big power is really what I'm after but there isn't much else out there now to do on this engine. Have the dinan money and the manifold is the same cost and if I don't use it now wife will! Chime in everyone.
Some background on the manifold:
http://m.automobilemag.com/features/...rag/index.html