I am looking to upgrade the exhaust on my 97 w140 Coupe. I was originally going to replace it with a cat-back system. However, I was at a local shop where one of the mechanics had a system that removed everything from the engine to the resonator (he kept the stock muffler). He replaced all of that with custom made tubes and high flow cats. Unfortunately, the car was not there. I was told that the system was comparable in price to putting on a performance muffler.

My question is what high flow cat should I use?

Steve

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97 S500 Coupe 139Kmi.
92 300CE 150Kmi. Sold
89 F250 Diesel 220Kmi. Dead
98 GMC 1500 160K.

Dynomax makes a good highflow cat. Check Ebay, there are tons of highflow cats that can be had for $50

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George Carstens