You can get an AEM high flow pump from Amazon. I heard good feedback about it. Put one on supercharged e39 540i and it performs well. If you feel comfortable to solder new plug, then it is probably cost effective alternative to OEM. Check out description on Amazon. The pictures shows pump and dimensions of the replacement pump. Looks like an easy swap. Just an idea.

http://www.amazon.com/AEM-50-1000-Hi...=aem+fuel+pump

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2012 X5 x35i My new toy
2005 X5 4.4 Her's (Retrofitted Servotronic Steering Rack)
2003 X5 3.0 Mine (Retrofitted Servotronic Steering Rack and Heated Steering Wheel)
2001 M5 Son's car
2000 540i 6sp Sports pkg, supercharged. Son's car (Sold)
2001 530i (Sold)
1999 528i (Sold)
1975 2002 (Sold)