de cat will this fit?

cheers i had seen one of these but i thought it would be the same just the other one was over 100 quid cheaper but actually looking at it there totally different...i can get a sports cat made for about 200 quid i think will this still give me the same power gains?
 
i think im right in saying that the restriction is mainly in the downpipe rather than the cat anyway?? could be completely wrong though lol
 
none of the eBay jobbys fit a A3 Quattro. i brought the a3 one and it sits where the axel that leads to the rear wheels is. and the s3 one won't fit as the flange is different , the flange is the correct one on the a3 pipe, only thing i can think buy the a3 one and have a custom exhaust centre bend the pipes to fit?
 
or buy the s3 one and have your current turbo/exhuast flange cut off and welded onto the stainless downpipe?
 

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