K & N filters, ugly black wheels, and that....hideous interior..ugly -- a horror.
I have seen the w210 e60 RENNTECH persoally in the U.S. Mercedes Benz classic center in Irvine, that the ad in question here had mentioned. The ad text states:
"These machines are considered very special and one of them resides at the US Mercedes museum".
Here are the pic's I took of that vehicle a couple of years ago on a visit to the MB Classic Center in Irvine, CA. :
It belonged to a well known US television celebrity I think named "Seinfeld" and was VERY tastefully done, except for the E60 badge and the chromed dual exhaust tips it looked pretty much just lilke a stock e55 AMG that had also been lowered a little bit more. (MUCH nicer than this.... pig...that is for sale here)..
__________________

1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...
1995 E 420, 170k "The Red Plum" (sold)
2015 BMW 535i xdrive awd
Stage 1 DINAN, 6k, <----364 hp
1967 Mercury Cougar, 49k
2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive

(sold)