I WOULD GO with KLEEMAN ......BECAUSE most ALL late MERCEDES have a MAJOR PROBLEM with crank pulleys
they BLOW up !! the center wears out and the pulley CAN fall off
1 LEAVING you STRANDED
2 WILL do MAJOR DAMAGE to water pump/radiator and anything
else on its WAY OUT
3 ALSO they MB use the SAME PULLY for several models so it would be SAFE to say the vibration dampner effect would be nil
AS if you use the SAME PULLEY on a V6/V8
GO figure...

Anyway the KLEEMAN PULLEY is a ONE PIECE PULLEY that
wont FAIL!
AND the results are VERY GOOD also I HAD UPSOLUTE do the software and the C coupe runs VERY STRONG !!!

Working on a better air INTAKE system ,have tried a couple but the results were POOR only 2hp (THANKS TO EVOSPORT)
For the use of the DYNO for the real proof

Just my .02