the left side cat on the 02 ML55 gave up around 85K miles.
It's out of warranty now and the dealer wants 1950 to replace it !
Does anyone know of an aftermarket company who sells the cat for the 02 ML55 ? I tried a lot of shops, online as well but they don't. ML320 and 430 are available but not for the 55.
Any help would be appreciated.

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.

Take it to a muffler shop and buy a high flow cat. Should be $200-300 for a decent set up with proper flow rate.

The cat should not have failed this soon. You might want to check the left bank of cylinders and make sure you don't have a misfire/rich running condition.

I tried calling but they all say they can only replace with the proper size/fittings. meaning aftermarket built to original factory specs.
Are you suggesting just welding the cat in the pipe ?

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.

You bought an AMG they cost more up front and so do all those special AMG parts. You gota pay to play...

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

If you don't want to pay $1950, that's your only choice.

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'01 SLK320, '79 450SL & '01 C320 -- What? 3 Mercedes? I am DEFINITELY crazy!!!

Yes , I'm telling you to have a decent exhaust shop fab one up for you.

The 5.5 l V8 (300hp) in your ML should have about the same flow / performance requirements as one of its american counterparts (Corvette, Mustang,etc) a decent exhaust shop can fab one with the proper flow rate and duty cycle for a fraction of the $2k, more like $200 or so.

As long as the shop does a nice install and suspends the exhaust on the rubber hangers as MB does, rather than welding it, I say do it.

I have purchased several cats for R129's this way, even get a certificate for CA emissions when I do it..You'd never know the difference.

You can also buy a "bolt-on" solution. There's a fellow in San Diego who will fab the cat and ship it to you for around $500 or so.. I can dig up his info if need be, but his cat is really no different than what a good shop could make for you...

The ML probably uses three inch exhaust. Shouldn't be a problem matching one up. Just tell them to be careful with your 02 sensors.

doesn't your ML fall in range of the current recall bulletin for cats??

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

There is a current recall on the ML cats and it doesn't matter how many miles you have.

Is there a link to find out about the recalls ? a webpage perhaps.
thanks again.

__________________
Whether you think you can or cannot, Either way you're right!. by Henry Ford.

call the dealer and ask for a service advisor. Give them your vin# and ask about the recall on ML Catalytic converters.