Hello,
first, i don't know if it's a good idea to put a 2002 S suspension in 1999 non S, because of the engine/transmission weight difference. Also the S setup takes the different unsprung masses into account (S brakes and wheels weight more).
I don't think that is a engine / transmission mount problem. Maybe if all engine and transmission mounts are totally worn. But that would only have a short momentum and should be balanced out by the drive shafts of the car.
I suspect there is a problem with suspension and sway bars.
Regards, Markus
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