The Subaru Impreza Exhaust explained.
Cat & Decat
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*Beware the new MOT requirements that the noise of an exhaust must not be unreasonably louder than a standard exhaust in average condition. Also new legislation regarding fitting catalytic converters to cars registered after 1st March 2001. Cats fitted to these vehicles must be "type approved for the vehicle" for road use, therefore all aftermarket non "type approved" cats fitted to vehicles registered after this date must be considered for off road use only.