Fit great, no problems installing, recommend for your 2013 2.5LT Jetta if your looking.
Highly recommend this product. It's not something you'll notice driving around town. But once you get into ~3000 rpm and higher, the noise it makes is really throaty and definitely adds character to your car. On higher acceleration it definitely feels as if my car is more ambitious and a little quicker on its feet. Only gave it 4 stars because sometimes I get a really throaty noise and other times it's on the quiet side. Not sure what's causing the inconsistency, but wish I got the throaty noise all the time.