text: Roof systems may be original equipment, factory options (provided by the car company), or installed aftermarket by a roof installation professional for the car dealer or retail customer. Once the vehicle leaves the assembly line, the factory option can no longer be integrated into the roof, making aftermarket the only option.
  Sunroof types
  Roof systems are available in many shapes, sizes and styles, and are known by many names. The main types are as follows:
  Pop-up sunroofs are simply a manually operated tilting panel. These panels are sometimes removable, and like T-roofs, must be stored when removed. The tilting action provides a vent in the roof, or a full opening when the panel is removed. Pop-ups can be installed in most vehicles, and are relatively inexpensive. Examples include metal panels in the Porsche 944, the early Mazda RX-7, and many glass panel factory and aftermarket installations.
  Spoiler sunroofs (tilt-&-slides) combine the features of a pop-up with those of a sliding roof system. They tilt to vent and slide open above the roof, requiring little headroom or roof length. Spoilers typically do not provide as large an opening as other roof systems, but offer the convenience of a self-storing panel. Most spoiler roofs are electric, with optional features like integrated sun shades and express open/close. Spoilers are ideal for short-roof vehicles where other types of sliders cannot be installed. Examples include the Honda CRX, the Toyota Celica and the Mazda RX-7.