The back end of the pump isnt nearly exciting as the top end... There are modest gains at the back. Turning the delivery valve holds is where the real money is at, but will make care idle like crap.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42