On one 87 Fiero I added the Fiero Store rear sway bar that I believe is the original Herb Adams design. I retained the OEM front bar. It made a huge difference in handling. The bump steer was gone and the car took the curves better.
On my 87GT 3800, I added the larger Adcco rear sway bar to the rear and ended up with severe oversteer. I then replaced the front bar with the Addco front sway bar and the handling is now great.
Case in point; the Adcco bars must be used in pairs but the Fiero Store bar can be used solo.
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "