Second pic is just a cat for the standard downpipe.
First pic is a whole new downpipe, with single 3 inch cat.
The milltek cats are a complete waste of money. The standard downpipe (2 pipe design) is the downfall of the s3 exhaust.
Hence 99% of people will get a 3inch downpipe with single 3inch cat upgrade (first pic)
As said, the twin cats in the second pic is to fit a std downpipe and will give you nothing for your money other than a hole in your pocket and a shiney thing where you can't see it...
All 3" aftermarket downpipes come with either a single sports CAT or a decat section... relentless is the popular choice on this forum as its pretty good quality and very affordable comparatively... look up the Relentless K04 group on facebook for some info about them..
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