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Thanks for the reply, Sounds like its not worth touching then i guess im best to leave the cat in place.

hi all, new to the forum just got my 197 and i currently have a milltek non resonated sytem with standard exhaust manifold and secondry cat still in place. I`d like to install the milltek de cat pipe which im led to believe deletes the secondry cat. My question is would this cause a flat spot...

That’s great thanks

Lovely car welcome, what spoiler is that?