your un-catted intregra will actually put out the same pollutants as 25-50 catted integras.
like the others have said, the extra 2-3hp isnt worth it. in fact, that 2-3 hp is only up top too.
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2016 BMW 340i M-Sport / 2013 Chevrolet Volt / 1999 Subaru Impreza RS EJ205