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[hoj]

Is it possible to DE-cat the 2.5V6?
If so whats involved and what will the changes be (if any)?
is it legal for Emissions/MOT?
what about the lambda sensors?
any problems that may occur?

[Mr Gav]

It certainly possible but definitely not legal, any car registered after August 92 has a legal requirement for cats.
Someone on here mentioned some decat pipes on ebay recently which should have provisions for lamda sensors as you would still need them.
You could run it decatted for most of the year and just put the cats back for the MOT, I did that with my Senator but if you get pulled by VOSA then it`s ticket time 

[Abiton]

I think the MOT doesn't actually require the cats to be there, but the emissions criteria will be unachievable without.

Lambda sensors won't be affected as they are upstream of the cats, assuming that you can leave them where they are.

[lee4206]

I think the MOT doesn't actually require the cats to be there, but the emissions criteria will be unachievable without.

Lambda sensors won't be affected as they are upstream of the cats, assuming that you can leave them where they are.

At present as long as the emissions pass(can and does happen) without the cats then its a pass. If the proposed changes to the test go ahead(very likely) then from 2012 its a straight fail if the cats have been removed.