I have an 08 jetta s. I had the same problem and actually just put new horns in about a week ago. 08s have 2 horns, high and low frequency. I got mine on Amazon for $17. The install was simple as I could get to both horns with my car on level ground without jacking it up. They were located right behind the front bumper on driver and passenger side. Had to get new bolts but if you search for VW horns they are plug N play. Total install took 20 mins and it is seriously loud now. They only use the high frequency when you lock and unlock the doors. So you still get the little girly beep getting in and out. Driving the horn is no joke. Hope this helps.
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