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you can pretty much see through a 200 cell cat.
personally i'd say to bung a 182 manifold on and run without a cat, just chuck one on when you need an mot.
this time on a 172 cup, previously rs tuner map, 182 exhaust manifold, standard cams and timing, powerflow exhaust, 200 cell cat and can't remember what induction kit??
have just stuck billet flywheel, 182 exhaust manifold and cams in mine. off to be mapped again on wednesday so will post results.
am sure it would still be fine as a daily. personally am not a big fan of the 197 cams as they are a bit of a 'compromise' especially for the price they are going...