They work, seen it with my own eyes. Fuel gains are minimal on the gasser 1.5-2mpg is what I've seen reported back with unbias testing.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]