In theory, if you are getting new elements they will raise the max rpm for you anyway while they are in there. Now perhaps the cam in the 3.5 pump isnt as good for high rpm but my 3.0 pump is set for 6000 rpm and I have not yet gone that high with it, nor do I plan to.

As an aside, I think user babymog had a 3.5 pump maxed out and rpm raised to 5000 with good reults so it is possible despite the low factory setting.

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Dan
2005 E320 CDI - 246k
1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k
Past: 1987 300D - 264k