I had them on a few cars before and they was alright personally on VAG cars I would go for Miltek or Blueflame
+2, i had a lovely system made up by blue flame for my old supercharged mr2 a few years ago, i'd originaly got a magnex system but the back box didn't last long as the over fueling burnt the arse out of the baffles in no time, disentegrated 3 magnex back boxes before i went to blue flame

The blueflame system was better all round, quality, alot lighter than the magnex and the original, it looked the dogs and i had no problems with the baffles it was spitting flames till the cows came home

This was the beast, you can see the blueflame exhaust in the 1st pic (note the back box is about half the size of the original and no cat the whine from the charger was awesome

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And the engine build i did;

Sorry for going off topic a bit there but basically yeah blueflame are decent systems