i had Konis, then Bilsteins, then KYB AGX on my 2004 jetta 1.8T. I liked the KYB AGX a lot, had no complaints. I kept stock springs.
To the OP, though the mfg recommends against using the AGX with lowering springs I have been very very happy with them on my MK IV wagon. Ride quality is basically OEM only becoming slightly harsher on MAJOR impacts ie, big ass potholes, NJ quality expansion joints. And this is with H&R Sports mind you.
My experience with KYB on Volkswagen's was not the greatest, they have a lifetime warranty, which is good, because I found myself replacing shocks constantly (about every 5,000 miles).
DO NOT -- DO NOT get them -- you would be better off replacing your shocks with 2X4s... they are the harshest ride ever -- even on the softest setting.
my uncle has KYB non-adjustable shocks/struts and they SUCK. I need a kidney transplant whenever i ride in his car. They are soo harsh and stiff, they actually reduce traction. No body roll, squat, or dive, but i wouldnt recommend them for a daily driver
i run brand new VW rear shocks with my H&R springs. i'm running KYB gas in the front. i'm very happy with them.
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