A6 C6 2.7 TDI Decat/Downpipe

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Originally Posted by Renesis

Diesels cannot currently fail on emissions alone as the only test for them on the MOT is a smoke test. The emissions are not tested like petrol vehicles so you won't fail if you gut the current cat.

It will fail a visual inspection (and subsequently the MOT) if there is no cat present however, or that it is obvious that it has been removed. New rules came in to force in February 2014 stating all cars that had a cat fitted at factory must still have it installed or it's an instant failure. This didn't apply to diesels before which is why it was more commonplace. Remember it's just a visual check though, and when I removed the cat from my last car, it still passed as it was covered by the engine undertray... And testers are not keen to remove components to confirm these things.

To answer your question however, there isn't currently a manufacturer that produces decat pipes for the 2.7 tdi, so it will need to be custom made, or the better solution would be to gut your current cat for no cost.

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If I gut the cat/get decat... will it through and engine code up...?

I know that an EGR delete will (these should be done with a remap and coded out), however am unsure if the sensors are that sensitive, if it does it will be the standard MIL which I don't believe is an MOT fail.

Guess what Mark, I am de catted.
Have since passed several genuine Mot without the need to'know someone'
I had my cat gutted so looks like still present and emission are still spot on.
My opinion is don't bother getting decat pipe made (none available off shelf) as will fail mot on visual inspection

2007 3.0tdi le mans
hybrid turbo, decat,miltek, 20's etc
330-350 bhp
450-500lbst