E320 CDI beat a E55 in 1/4 mile?
My '05 CDI had a Kleemann KD box, that certainly enhanced performance & was comparable (or better) to an E500, IMO.
The biggest hurdles with the CDI would be a much larger turbo & intercooler and better programming in the transmission (or different transmisison altogether). Also a limited slip differential & headers would be pretty much required as well.
My CDI would pull hardest (per my "seat of the pants" dyno) at around 2000-3200 rpms. The shifts were pretty slow & weak for sports car performance. The E55 pretty much pulls through the whole range.
My CDI was 6000 miles away from going out of warranty & these thoughts did cross my mind, but finding someone to do the work made it entirely cost prohibitive. I spoke with Cory @ Kleemann about additional mods & he said there just isn't enough demand for a larger turbo/intercooler/headers etc. for Kleemann to pursue it. Plus there really aren't that many CDI's running around the US.
Just my $.02
My KD Box is for sale; great starting point for someone

https://mbworld.org/forums/classifieds/214168-fs-kleemann-kd-box-e320-cdi.html
Like 240D… wrote, it can be done.
Annual vehicle inspection might be some kind of happening….
Big wallet.
Big cooler.
Big VNT-charger.
Bigger injectors.
Big exhaust pipes.
1600bar and remapping.
Lots of time.
Lots of smaller mods.
Here is one version.
W124, OM603, tuned pump, Garrett 42VNT, boost/egp ~3bar.
+420hp/+600nm.
Too much power and torque for that car.
Horrible to drive and crazy driver.
Yes, I have been inside that car…..
Here
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The Best of Mercedes & AMG
http://www.youtube.com/watch?v=ORPWDn2UD6s this will tell all
and this http://www.youtube.com/watch?v=ep-soNJ8D8Y and this http://www.youtube.com/watch?v=iWCmf...eature=related
i love older mercedes diesel's








