You might also consider a straight pipe to replace the center resonator. I know many of the 500E owners have done so
for performance and a more agressive sound. Also saves 50+ pounds of weight.
1992 500E Smoke Silver
2002 CLK55 AMG Cab Silver/Black
2001 Harley Fatboy - Pearl White
2004 F150 FX4 Silver/Grey
1969 GTO Liberty Blue
1956 F100 Black