Water injection is a cheap way to cool the charge air from the turbo in lieu of an intercooler. With the stock setup, it's pointless - it achieves nothing but can risk hydrolock from water being incompressible. Usually water injection goes along with making big power - the 603.97 is a poor choice for big power due to many design issues, the 603.96 is a much better candidate, or better yet, the OM606.
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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