Yes the 500E, was a collaboration by Mercedes and Porsche which stuffed a 5.0 motor into a W124 sedan for the ultimate stealth street fighter. Only the slightly flared fenders and the 500E trunk badge gave away the came but the car could be debadged for greater stealth. This was a stunning ride.
www.500ecstacy.com
Satish Tummala (STUMMALA) on this board, I heard was completing a 5.0 transplant into a 300CE coupe, a one off project that may be finished by now. Check out his posts here, or his website
www.mbcoupes.com for further information on that project. He really knows what he is doing and a great guy to boot, I had the pleasure to meet him...
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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)