Replaced the DISA with OEM unit, car runs smooth. I'm not pulling the IM off to look for it. The flap is either buried deep inside the manifold or it could have been removed by the previous owner/owners

seriously contemplating on trading the X5 in.

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looking for stock E53 amplifier Part 65 12 8 379 376

Thrust arms bushings write up:
http://www.bimmerfest.com/forums/sho...d.php?t=506735