4 boxes in exhaust system - Alfa Romeo Forum
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1999 Spider

4 boxes in exhaust system

How many and which of the four silencers/cat are best to remove when fitting new exhaust system ? My Spider failed MOT owing to exhaust so I am getting a fabricated stainless steel fitted. Whilst it's being done I have been told that removing some of the boxes will improve performance but, I don't want to risk emission failure. Any advice on which, if any, boxes could be removed?
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Apparently the rear is ok, but to be honest I wouldn't risk it - why not simply buy a sports cat?
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look at one of the performance system's and copy it
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boxes , exhaust , system

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