The easiest route for the M44 is probably an adaptor cap from VPD running to a Setrab or Mocal cooler. I'm not terribly familiar with the M44 engine...but...if it shares the threaded cap with the E46 non-M3's then they should have you covered.
www.victoryproductdesign.com
Good luck,
Mark in St. Louis
ITS BMW 325is
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