I did this on my Jetta when the cat died. You could fit it yourself in a few hours, the turbo bolts are the trickiest bit to do.
Given the price this pipe will not have a very high spec cat in it so you will get a warning light from it. I have used a spacer to avoid it, but you have to mess around a bit as too long a spacer it complains of running rich, too short or none complains of poor cat efficiency. I found the sweet spot and no issues since.
My car in not tuned, the new pipe makes a bit more noise but not much, car feels a little bit more grunty but could be the noise, or could be the old cat was restricting.
If you go an get a tune the emissions check can be coded out and no warnings ever again.
When it comes to performance tunes do some homework, there are many discussions on the forums.
MK4 GTI - Sold
MK5 Jetta Turbo - Sold
MK5 Jetta 2.Slow - Until it dies.
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