Spoilers are an easy way to customize a car, but they can be tricky to install. With some careful measurements and a little bit of time, you, too, can install a spoiler (also known as a wing) in just a few hours.
First use the masking tape to cover the rear of the trunk onto which you will be installing the spoiler. This is to protect the paint as well as using for measurements.
Using the tape measure, find the center of the trunk. Three points make a line, so mark the center of the trunk in three spots down the center of the vehicle and connect the dots to make a line. This will be the primary measuring point.
Measure the spoiler that you're going to install. Some spoilers have three mounting points, while others have just two. Either way, the measurements will be the same. Measure the width of the mounting holes on the wing.
Take the measurement you just made on the wing and divide it in two. That is the center of the spoiler. Take the new divided measurement and mark from the center line on the trunk out. Use the pen or marker to put a spot on the trunk where the holes will be. Do this to both sides, using the same three-dots-for-a-line process.
Place the wing on the vehicle and take a step back. Make sure the spoiler appears centered on the vehicle. You haven't drilled any holes yet, so make sure this is exactly where you want the spoiler to be, because this is your last chance to get it right before drilling.
Generally there are two mounting holes per side on a spoiler. Measure the difference between the two holes, divide it by two, and mark that point on the outer lines that you've marked on the trunk. Then mark the two holes on each corner.
Set the wing back on the trunk, this time try to place each end of the spoiler so that the mounting holes are as close as possible to the holes you've marked on the trunk. Step back again and confirm this is exactly where you want the spoiler. Make any adjustments if needed.
Use a small drill bit to drill the holes that you've marked. If there is a wire for a third brake light, mark where that hole needs to be and drill it out as well.
Use progressively larger drill bits until you find one that is one size larger than the screw used to mount the spoiler to the trunk. Sometimes it's a screw, sometimes it's a bolt, so be prepared for both options.
With a friend helping you hold the spoiler in place, start attaching the screws in from the bottom of the trunk into the spoiler. Loosely fit the screws until all of them are set.
Close the trunk and make sure everything is lined up and straight. Remove the tape. If the spoiler needs minor adjustments, it may be possible to open up the holes that mount the spoiler, but it depends on the width of the base. Once it it set perfectly, have a friend hold it still, then tighten down the spoiler to the trunk.
