Exhaust Question !

Right had the car up on some ramps at my mates earlier, the exhaust is in pretty bad nick all rusted up, no holes yet but i don't think it has much left in it.So I'm thinking good excuse to get a proper exhaust system, catback exhausts would be the way i want to go due to ease around MOT time !Now due to me being an idiot i want to know basically can you get a system that fits on after the 2nd cat ? or do most systems start after the first ?

Cheers
 
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