that you can buy [for example from E V O sport dot com in California]which will allow more flow but it will also be louder than stock. I can't speak for Europe but I'm sure there are products there as well. Even if you go the custom route and get an entire catback set up [like I have from supersprint] it will cost you more overall than just replacing the cat at the stealer.
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MODS:Kleemann Kompressor\Hardwired Valentine One\Burl/Black leather Armrestcover\Rear Burlwood Switch Cover\Burlwood/Ash Leather Shift Knob\Chrome Gear Shift Encase Set\Single Flat Burlwood Drinkholder\Burlwood/Black Leather Steering Wheel\Bose Tweeters w/ Sail Panels\Wood Trim for 3 Vents\Wood Dash Kit\Glove Box Organizer\Chrome A/C Switch Rings\Burl Frame for Instrument Panel\"nr" White Instrument Gauge Face\Chrome Gauge Cluster Rings\Passenger Floor Cargo Net\MB Stainless F&R Door Sills\MB Rubber Floor Mats\Cargo Tray with Organizers\Hella Bi-Xenons\LED front turn signals\Chrome Sport Grille\PP Chrome Front Bumper Grille\chrome head light rings\Hella xenon micro DE Foglights\Tailgate Filler Panel\Rear Spoiler w/ clear/red LED brake light\45 LED 3rd Brake light\'02 Tailights w/ LED brake lights and wired-blinking side markers\chrome taillight rings\Supersprint Muffler & Exhaust Kit w/signature Round Supersprint Tips\Chrome Tailgate Handle\AMG 18" Rims w/ DUNLOP SP 9000s\MB Blue Laurel Center Wheel Cap Emblems\Red calipers\Cell Phone Antenna\Lamella Skyview Wind Deflector\OEM Fender Flares\MB Polished Stainless Steel Step Bars\AMP Alloy Fuel Door Flap\Chrome Side Indicator Frames\Kleemann "K" and G-klasse "8" Side Emblems\Chrome Door Side Strips\Chrome Shell Inserts\chrome door handle covers\Chrome window sill covers\LED blinking side view mirror covers\12.1" Directed Video LCD OHD w/DVD.
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Does it just have a bad weld? If so, just remove it and have it heliarced. It is easy to remove as long as removing the torsion bar doens't scare you. There are several discussions about this. If the cat itself is bad you have no easy solutions.
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warning triangle, 133,000 miles
Had the same thing done at my m class yesterday. After driving through heavy rain, some water slapshed up under the car and hit the first catalytic converter on the passenger side. When the cold water splashed on the hot cat, the weld seal that goes all around the cat cracked. Since then I had a exhaust leak and it sounded horrible.
I took it to a custom exhaust shop in town and they welded it for $60.