Eisenmann Race Exhaust...

Got my new Eisenmann racing exhaust on my CLK430, and i love the sound, deep and throaty. Small question: how long before that smell coming from the exhaust(i assume burning off stuff inside) will go away? anyone know? sorry i have no idea how to post sound clips, ill try soon. Thanks in advance.<br>
ERIC

The smell is gone now. My resonator is still on, and it is welded.