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Ground effects and spoilers make a car look totally different. Ground effects are on the bottom of the car, spoilers are on the top of the car and typically in front or behind the wheels.

Ground effects can be installed onto vehicles without ground effects, but the bumper covers need to be changed as well since the ground effects are molded into the bumper covers on most models. 83-84 models the bumper ground effects can be transferred to the existing bumper cover.

Deck spoilers can be added in most cases simply by drilling holes and bolting them on. On 3rd gen models, you need to be aware of the 3rd brake light, as 87-90 models have the light in the spoiler, 85-86 and 91-92 models have the light in the hatch. On 4th gen models, the Trans Am spoiler is removable, however, it will not bolt to the Firebird hatch, so the entire hatch needs to be changed with the spoiler.