E60 530D M57N...Exhaust Manifold Replacement
 

Has anyone had the pleasure of replacing the exhaust manifold on theirs and whats best replacement to go for - I'll be going cast iron this time but is it better to go with a...

• OEM E39/E46 zort mani (Are they the same even)
  • Will these need any mods or direct like
  • Gaskets the same?
• One of those new cast off shelfers like these:

http://www.ebay.co.uk/itm/200984412537?_trksid=p2060778.m1438.l2648&ssPageName=STRK%3AMEBIDX%3AIT
http://www.ebay.co.uk/itm/BMW-E60-E6...item2ec71a9afa

In relation for the fitting, seen a few approaches...but is it easier via top (looks like stripping allot more out mind) or from underneath (seems less to remove but bit blind...sure theres other woes)

Ta in advance!