I had the same thoughts about my SDL vs the 5 cyl D. The low end was doggy. I did some research on this site look at the link below from 1/11/02 made all the difference in the world for my SDL.
http://www.peachparts.com/shopforum/showthread.php?threadid=29482[/U]

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15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
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