Full exhaust system on 2.2 HDi

[406loon]

According to a previous thread on new MOT testing rules - 1st of Jan 2012 any car that was fitted with a car post 93 will have to have a cat - thats why I am fitting one, otherwise I wouldnt bother.

[Doggy]

Thanks for the info Eric. When you gutted the cat did you notice a lambda sensor(s) in the system? I am thinking of having a downpipe made up that would cover the length of the old downpipe/cat (3'') and then bolt to a universal 100 cell cat in 2.5'' then bolt to a 2.5'' middle section (no silencer) and then a backbox.So basically the cat will sit where the DPF would be. This way it will remain legal regarding the future MOT test while not being restrictive and hopefully not too loud either - The only thing which might be an issue is dealing with the lambda sensor(s).

Alex

Diesels don't have lambda sensors.
The 2.2 has upstream & downstream temperature sensors, plus two pipes which lead to the differential pressure sensor that monitors FAP backpressure, (all of these are required simply for FAP monitoring & regen). Once you de-fap your car you don't need any of them, (or the additive tank, ecu and so on), but I think the prudent way to go is to leave no external signs that anything has changed, then I don't believe there will be any issues come MOT time. I suspect anything you do after the cat/fap chamber won't matter to Mr MOT, (unless it's too loud).

If they can insist on a cat, maybe they can insist on a FAP too.........