crownroyal

I was going to have a local exhaust store that does great work to make me a custom aftermarket downpipes for my car and they told me that they couldn't do anything to it since epa states that they can only change the cat if it is damaged or after 50k miles. Yes I know there are things that are test pipes that totally replaces the cat on A4's but these downpipes for the S4 are suppose to be 50 state legal. So i guess i'm wondering how can we really use the labree and milltek downpipes?


I did a little research on epa's website and got this.
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(6) When can I install an aftermarket converter?

Generally, there are only 3 situations when you can install an aftermarket converter.

They are:

(1) if the converter is missing from the vehicle when brought in for exhaust

system repair; or

(2) if a State or local inspection program has determined the existing converter

has been lead poisoned, damaged, or otherwise needs replacement; or

(3) if the vehicle is more than 5 years old or has more than 50,000 miles*

(8 years/80,000 miles for 1995 and newer vehicles) and a legitimate need for

replacement has been established and appropriately documented (e.g., a

plugged converter or unrepairable exhaust leaks).

Any other converter replacement must be with a 'certified' or new original equipment (OE)

or equivalent converter.

Aftermarket converters subject to the enforcement policy requirements cannot be used for

replacement if:

(1) the existing converter is present and functioning properly; or

(2) the replacement is under recall or warranty; or

(3) the vehicle is returning from overseas use

VerrÜckt

Your shop is right. Sorry.

crownroyal

So you are saying that technically it is "illegal" to have the labree or milltek dp's on a S4

Schadenfreude

Sting operations to ensure that we weren't selling used cat's to people. I had aftermarket cats on a Supra at the time and the gist I got from the inspector was that aftermarket cats were discouraged but the EPA didn't care provided the car still passed emissions tests

monkeypilot

Tell them it's a track car.

VerrÜckt

only". Tehcnically, you can be fined for using any of these products on public roadways.