Just had our N52 intake manifold off. I couldn't imagine doing it without doing so. You probably don't have to disconnect all the wiring and CCV system (if yours is like mine) and you should be able to do reach between the head/block and remove the inner DISA.

You getting a code for this? I hope it's not a common failure because I just did a whole rehab of mine (complete CCV setup, VCG, 4 front head bolts were broken) and did not replace that while in there...

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)