welcome to the cruddy sound of a mk5 Jetta.
It's terribly designed.
Yes you can install the likes of Arc Audio KS125.4 Mini from the factory stereo.
It will sound a little better, But Sounded the doors of the car and then you will notice a great improvement.
But Which radio do you have ?
RCD300/RCD500/RCD310/RCD510 or RNS510?
The RCD300 radio sounds like crap.
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