Cars with extra trimming are a common feature on our roads.a. But as it turns out, several car accessories make no substantial impact on car’s performance, while some actually compromise it; these include: *Body kits look impressive; they consist of fiberglass pieces that are attached under the front and rear bumper, as well as long the sides and under the doors. Body kits restrict air flowing under the car and therefore improve stability. However, they only work at speeds in excess of city speed limits, frequently scraping and breaking when u encounter speed breakers.<\/p>