is it worth decatting the standard exhaust?

in some cases it brings the light on and some cases it doesnt, it luck of the draw
 
It must work at a ratio of 1:100 of the light coming on then.. I've never known of it to happen to anyone not even mine.
 
theres been one or two that have had the light come on, one or two that have failed emmisions, ans some that have the light flash now and again in warm weather
 

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