I have found that installing (anti) sway bars requires careful matching. On one Fiero I added the Fiero Store rear bar to an 87. That seemed to improve handling. On my current Fiero I tried adding the heavier Addco bar to the rear and got tons of over steer. Had to change to the Addco front bar as well. to correct things Point is that on the 88 Fiero GM did a pretty good job matching front and rear suspensions. If it were my car, I would keep the stock 88 sway bars
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "