Wow 9 seconds thats slow. but 7.1 is good have you ever tested it in a lower altitude?
Sounds like a great set up.

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-1999 ML320
-1995 E320
-1994 E420 (lowered 1.5 in useing Eibach)
-1980 300D
-Had 1985 300TD Wagon (for over 10 yrs)
-Had 1993 190E 2.3