A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

Any success stories of aftermarket cat installs?

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Old 02-13-2006, 01:49 PM
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Default Any success stories of aftermarket cat installs?

I'm constantly getting the 16815 'Warm Up Catalyst: Bank 2: Efficiency Below Threshold' code. Rear O2 sensors are due for replacement, but I still think it's left cat (the right one was replaced 2 yrs ago), and with my 110k miles, I'm out of warranty. And the ECU flash recall apparently doesn't apply to my VIN.
Old 02-14-2006, 03:00 AM
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Default I replaced the left side cat on one of the 2.8's with an aftermarket unit.

This was a bolt in solution, no welding needed. $350 from CT Cat.

It's a little louder than the factory cat when the car is cold, but fine at temp, and no more rattle or cel. My original cat lasted 180k.
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