Just got an A6 (109k), learning all about them. However, it just set off a engine light warning because of a catalytic conv reading. The local Audi shop said that was a common problem with stock cats, that the sensors were too restrictive and that if I took it to the dealer to have it tested, they might OK it's function and change the chip settings to a wider normal range to not set off the sensors.
Sounds reasonable, but what do I know.
Part 2... Alternative option ... getting VAST piggie downpipes with the new cats on em? I understand that they decrease resistance and therefore make my turbos more happy with less lag (and I need the turbos to last as long as possible). What's the downside? Does it get noisy? (I'm old enough to think a noisy exhaust is a bad thing). Worse MPG? Bad emissions? Also, I read about chipping after getting the DPs. Is that necessary? I do actually have an MTM already installed, but no idea how I would adjust the thing if necessary.
Anyway, just a newbie trying to understand things, and very appreciative of any help. Thanks,
All Vast Piggies are.. are your stock DPs gutted and relocated O2 Bungs pass the precats so yuo don't throw a cell and can pass emission tests. NO downside. NOT NOISY, sounds barely barely louder than stock. A little deeper. Definitely adds torque and you'll feel the extra grnut at low RPM;s
I HAVE HEARD GOOD THINGS ABOUT VAST PIGGIES. I WENT WITH APR'S DP'S FPR MY A6 2.7T
OOOO
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Spec Stage II Clutch and Aluminum Flywheel, APR Software, APR Snub Mount, APR Downpipes and Test Pipes with Milltek Cat Back, Hyperboost Diverter Valves, K&N Drop In (Temp).
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downpipes? - 
