I contacted Vath and they do have a regulator that will boost the fuel pressure on the slk320', it's kinda pricy, but I bet it's a MBZ part, would be nice if someone could order it for research and developement.
.
"We have such a fuel pressure regulator as well.
You can have it for 290 € + VAT + shipping."
Mit freundlichen Grüßen
Daniel Welzbacher
********************************************
VÄTH Automobiltechnik GmbH
Aschaffenburger Str. 75
D-63768 Hösbach
Mobil +49-(0)170-350 80 08
Tel. +49-(0)6021-45474-0
Fax. +49-(0)6021-45474-26
Internet: www.vaeth.com
E-Mail: daniel.welzbacher@vaeth.com info@vaeth.com
Sitz der Gesellschaft ist Hösbach
Geschäftsführer: Jasmin Ehret-Väth
HRB 7071, Amtsgericht Aschaffenburg