Cyclocross:

MKB in Germany also makes a center y-pipe for the C43 (called the sound pipe) to replace the resonators (their contact info is on the AMG_Owners_Club.com public forum). You could combine that with two Random Technologies catalytic convertors and a Remus muffler and have about the same system.

MKB also makes a header for the C43 with two full race metallic pre-cat's in it. That alone, I'm told is good for 20hp but, it is very loud.

Replacing the main cat's with high-flow versions, killing the center resonator and changing mufflers should give you the best usable street performance upgrade. The OE cat's are very restrictive.

Marc

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Marc
C55: Evosport headers & UDP's; AMS crank; TVT thermo; phenolic spacers; Denso IK16's; EuroTech ECU; RennTech cf airbox w/ Green filters; Z06 catch can; Sprintbooster; Optima RedTop; Quaife LSD; AMG: shift paddles, 030 rear calipers & rotors; Rotera brake lines; Euroteck CF lip; "C63" rear diffuser; 18" SLK AMG Turbines (summer); 18" OZ Superleggera's (winter); K40 dual f&r radar w/ laser jammers; MB: digital climate control, iPod kit & mp3 CD changer; iTronic B/T for MOST.