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No, 182 is metalic and much more free flowing than the 172 ceramic one, you can either decat it or look for a 182's, I have 182 mani and cat, and have tried it decat also and there is no difference, so cat stays on.
That yes, decat is much louder, I have a REMUS exhaust and decat sounds delicious, but better not to pollute much, I out flangs on the cat, so it is an easy in/off if I want more sound for a time.