Hellwig is a vehicle springs and sway bar manufacturer that has been in business for over 60 years. Their products help with suspension enhancement and they specialize in suspension systems for trucks. They are a part of the Special Equipment Market Association, or SEMA. The Special Equipment Market Association is a trade association consisting of a variety of manufacturers, distributors, retailers, car clubs, auto restorers, and more. The members of SEMA make, buy and sell a variety of specialty parts. SEMA is well known for their help in fighting for the rights of vehicle enthusiasts to drive customized vehicles.
Shock absorbers, more commonly termed shocks, are the parts of a car that help create a smoother ride for the vehicle. When a vehicle is riding down the road there are often bumps that it will come in contact with. Shock absorbers allow the vehicle to smoothly travel over these bumps without there being a rough force applied to the vehicle. In a sense, the shock absorbers work as springs that allow the tires of the vehicle to move freely with the bumps while the vehicle essentially remains unaffected by the bumps, and thus remains still.
Fuel injection is the process of mixing fuel with air. This happens in most engines because today most are internal combustion engines. Simply put, fuel injection the way fuel is delivered to the engine in order to keep the car running. The fuel injection system meters how much fuel is needed to be sent to the engine. Today, most engines meter the amount of fuel electronically. It used to be the case that fuel was metered mechanically.