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
LS2, AWD, Red Tint Jewelcoat, and Eff'ing dubs
Yank PTB3600, Kooks 1 7/8" LT's, 4" Fenderwell intake, LS1 E-fans, Magnaflow, LS7 TB, Sonnax shift kit, tranny cooler, tune.
Lowered, HID's, tinted.
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds