Piggie Pipes (...what is this?????)

[nikkak77]

Guys,

While the car was in the workshop for teh clutch issue, I had asked them to keep on the stock cat back and remove the pre-cats.

The guys there once they removed the exhaust system, instead of coming across the standard "ceramic" materail, came across the below metallic stuff inside.


Since I am the 2nd owner of the car and due to that I cannot locate the previous owner who had claimed that the car was entirely stock, do you know what it is we are looking at?

[TonyHayers]

Um, that's just catalyst material. What was he expecting? ceramic floor tiles?

[rwilsonrs4]

yeah thats the std OEM precats whch are the same as the ones further down but closer to the manifold so heat up faster to reduce emissions earlier ,

[nikkak77]

Just noticed that i failed to describe it correctly.

Instead of finding inside after the mesh on the pics the honeycomb material, we found sth like a metallic precat.

Have you ever seen sth like that?

[bhprs4]

The RS4 uses a metal cat in the pre cat. So you won't find the normal ceramic honey comb material.
To remove I used a drill to help break it up and then pulled out in bits.

[nikkak77]

The RS4 uses a metal cat in the pre cat. So you won't find the normal ceramic honey comb material.
To remove I used a drill to help break it up and then pulled out in bits.

Thanks for the tip. Had no idea.
It is now off...

[sakimano]

They're basically metallic race cats. Unlike almost any other audi I've seen before

[nikkak77]

I always thought - by mistake obviously - they had the honeycomb material.

I removed them and the strange thing is that i have not a CEL light.
I have driven it for a couple of days now in mostly small distances but no light at all.

I have neither added spacers on the O2 sensors nor moved them further apart.

Shouldn't have produced the warning light?

[sakimano]

It will come don't worry. Can take 100 miles.

You probably already have fault codes... Maybe have a look?

[nikkak77]

No fault codes in VCDS....

[voidopolis]

No fault codes in VCDS....

did you end up ever throwing a code or have any problems?

[nikkak77]

Yes, but fixed it via a tune