Eibach are for look only, the ones mentioned by Superman give both performance and look.
I had the ProKit on my old T/A for a while, looked good but when I upgraded to Strano springs I noticed a big difference.
2008 Trailblazer SS SOLD
LS2, AWD, Red Tint Jewelcoat, and Eff'ing dubs
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds