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It's a decat pipe which replaces the catalytic converter, try a search dude, but basically...
Positives, allows the engine to rev more freely thus releasing more power..
and gives out more emissions ;)
Negatives, has to be replaced before every MOT..
I'm not supposed to "do that" either...
But if someone was in my face blatantly taking the c**t out of me and not following the correct "code" of how to work out these sort of things...
I'd smash his head in, play his game and make sure after it all that he never knew your reg.