I was wondering if anybody has these on their car and how they perform? Also they say they have a adjustable lower spring perch does this mean you can adjust your ride height like a coilover?

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2000 Audi A4 1.8T Quattro Tiptronic [ Borla cat-back,forge DV, Euro spec headlights,RS4 Grill,vogtland springs,18"s,ABD Intake,Godspeed FMIC, APR Boost Guage, Replica RS4 kit, GIAC chip]