Cars that cost more money are usually built with better materials or more emphasis goes into those materials.For Example, we will compare the trunk compartment of three cars from my family.
1989 Chevy Cavalier Z - 24 Convertible
1991 Cadillac Brougham De Elegance
1991 Pontiac Bonneville
The 89 Chevy had a black " Felt like " material covering the steel trunk floor and a portion of the inner wheel wells. The piece covering the trunk floor slid all over the place and would end up balled up in the corner from heavy items sliding around in the trunk. A piece of carboard was pressed in behind the backseat. There was nothing covering the rear quarter panels to protect them. A black piece of fibreboard covers the spare tire well.
The 91 Bonneville has thick sound deadning material on top of the trunk floor and is topped by a grey, slightly heavier weight felt like material. A piece of cardboard is pressed in behind the backseat. The wheel wells, tail panel and quarter panels are covered by a form- fitting carpet like material. A formed plastic cover covers the spare tire well. The inside of the trunk lid has a carpet - lined fiberglass trunk lid liner.
The 91 Cadillac has thick sound deadning material on the floor of the trunk and is topped by a heavy weight carpet. There is a full width two-sided matt, one side is rubberized, the other side is carpeted. and that sits on top of the carpet. The quarter panels and wheel wells are covered with a heavy weight carpeted carboard with sound deadning material attatched to the back side to block out road noise. The spare tire ( exposed ) sits up on a slight ledge and has a carpeted covering. and behind the tire is a small piece of heavy weight carb board behind the rear seat. There is also an automoatic power pull down for the trunk lid.
More sound deadning materials are used behind the Cadillac door panels, in the roof, under the dash. etc where a less expensive car wouldn't have such materials
The Bonneville and Cadillac also have a plastic sheet glued to the inner door to act as a water barrier, whereas the Cavalier had a piece of heavy black paper glued to the inner door.
This is just one example of how different materials can be applied to different models. Other manufacturers do the same thing with their different models.
========= Harryface =========
1991 Pontiac Bonneville LE ~_~_~270,000 miles_~_~_