As I am not one of the real "do it your-selfers" here, which one do I want? I want a little more thrust off of the line, but I am going to have to have my shop do what ever the install calls for. So which one ofd these is preferable?

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Paul Levitt
1990 560SEL
1986 300 SDL
1988 300E
1992 400E (sold after 17yo crashed!)