They are there to reduce nox emissions which is tested in mainland Europe but not here in the UK...i think?
I'm sure somebody will correct me if i'm wrong :)
I have just blanked mine off and had it mapped out. Cant think of any cons what so ever.
Pros are ofc cleaner intake and you don't have to worry about it failing. I also removed the cooler so I don't need to worry about that either. Doesn't affect the MOT either mine just flew through :)
I've never heard of a diesel failing on emissions. I dont think they even stick the pipe in at my local mot station, ill check within the next week as it due :D
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