That is the brake upgrade. I believe it's the Grand Am upgrade. The vented rotors are similar to the 88 rotors and does away with the solid disk rotors of the earlier Fieros. I think it also has larger brake pads than the stock Fiero pads. Better stopping power and less heat fade than solid rotors.
Budgetman is doing the TFS upgrade and has encountered incorrect mounting brackets in the kit. Someone packaged multiple brackets for the same side, then upon replacement, got another one for the same side. The kit also had a pair of wheel bearings that were rusty and the wrong size. He said they have been very accommodating to try to get the parts issues resolved, though.
