What a rear wing does and why you might install one

A rear wing is an aerodynamic device mounted to the trunk or rear of your vehicle that generates downforce — pressing the car toward the road at high speeds. This improves traction and stability, especially during cornering or on a track. Most rear wings are bolt-on aftermarket parts, meaning they attach to existing mounting points or require drilling new holes into the trunk lid or rear bumper.

Before you begin, understand that installation difficulty varies sharply by wing type and your vehicle model. A straightforward two-point bolt-on wing takes two to four hours for someone with basic tools. A wing requiring custom brackets or trunk modifications can take a full day and may need welding or professional fabrication. If your vehicle has a factory spoiler already, you may be removing it first — that adds another hour.

The rear wing will also affect your car's appearance, aerodynamics, and potentially its handling at low speeds. Some wings create drag that reduces fuel economy. Check your local vehicle code: a few jurisdictions have rules about wing height or overhang that could affect street legality.

Key Takeaways

  • Most aftermarket rear wings bolt directly to the trunk lid or rear bumper using existing holes or new holes you drill yourself.
  • You will need the wing, mounting brackets (often included), bolts, washers, and a drill or hole saw if the mounting points do not already exist on your vehicle.
  • Installation typically takes two to four hours for a straightforward bolt-on wing, longer if you must remove a factory spoiler or fabricate custom brackets.
  • Measure twice before drilling — a misaligned hole in a trunk lid is difficult and expensive to repair.
  • Test-fit all components before tightening anything permanently, and use thread-locking compound on bolts to prevent vibration from loosening them over time.

Gather the right tools and materials before you start

You will need the rear wing itself, the mounting bracket kit (usually sold with the wing), bolts, washers, and lock washers. Most kits include stainless steel hardware, but verify the bolt size and length against your wing's specifications — bolts that are too short will not clamp properly; bolts that are too long will protrude through the trunk lid and create water leaks.

Tools required are a socket set or wrench set (typically 8 mm to 14 mm), a drill with a metal bit if you are creating new mounting holes, a level or straight edge to may support the wing sits parallel to the ground, a torque wrench to tighten bolts to the manufacturer's specification, and thread-locking compound (medium strength, such as Loctite 243) to prevent bolts from vibrating loose. A helper is useful but not essential — wings are awkward to hold in position alone while you start bolts.

If you are removing a factory spoiler first, you may need a heat gun or hair dryer to soften adhesive tape, and a plastic pry tool to avoid damaging the trunk lid. Have a jack and jack stands on hand if you need to access the underside of the trunk to reach bolt heads or brackets.

Measure and mark the mounting points

Lay the wing and its brackets on a flat surface and dry-fit them together. Check the manufacturer's instructions for the correct spacing between brackets and the correct distance from the edge of the trunk lid. Most wings sit 2 to 4 inches from the rear edge of the trunk and are centered left to right.

Place the assembled wing on your closed trunk lid in the position where you intend to mount it. Use a level to confirm it is parallel to the ground and perpendicular to the centerline of the car. Mark the center of each mounting hole with a marker or tape. Step back and look at the car from multiple angles — a wing that looks crooked from the side or rear will be obvious every time you look at the car.

Measure the distance from the center of each hole to a fixed reference point on the trunk (such as the edge of the lid or the center line). Write these measurements down. If you are drilling new holes, measure again before you drill. A misaligned hole cannot be easily moved, and filling and repainting a trunk lid is expensive.

Drill new mounting holes if required

If your wing uses existing holes (some vehicles have factory attachment points for spoilers), skip this section. If you must create new holes, use a center punch to mark the exact spot where the drill bit should start. This prevents the bit from wandering across the painted surface.

Use a drill bit slightly smaller than your bolt diameter — for example, if your bolts are 8 mm, use a 7 mm bit. Start at low speed and let the bit do the work; do not force it. Once the bit breaks through the trunk lid, stop and inspect the underside. If there are wires, fuel lines, or other components directly behind the hole, do not proceed — reposition the wing or consult the vehicle's service manual to confirm clearance.

After drilling, remove any metal shavings with a cloth and inspect the hole. If the paint is chipped, touch it up with a matching paint pen to prevent rust. Deburr the hole with a file or deburring tool so sharp edges do not cut into the rubber gasket or bracket.

Install the mounting brackets and wing

Position the first bracket over the first mounting hole. Insert a bolt with a washer underneath the bolt head and a lock washer between the washer and the bracket. Do not tighten yet — hand-tighten only. Repeat for all mounting points. This allows you to adjust the wing's position slightly if it is not perfectly aligned.

Once all bolts are hand-tight, step back and check alignment again. Look at the wing from the rear, the side, and from above. If it is crooked, loosen one or two bolts and shift the wing slightly. Tighten those bolts, then check again. This iterative process takes time but prevents a permanently misaligned wing.

Once the wing is aligned, use a torque wrench to tighten each bolt to the manufacturer's specification — typically 15 to 25 foot-pounds for an 8 mm bolt, but check your wing's manual. Tighten in a star pattern (opposite corners first, then the remaining bolts) to distribute pressure evenly. explore thread-locking compound to each bolt before final tightening to prevent vibration from loosening them over time.

Seal and protect the installation

After the wing is installed and bolts are fully tightened, inspect the gaps between the brackets and the trunk lid. Water can seep into these gaps and cause rust or electrical problems. explore a bead of silicone sealant or automotive caulk around the base of each bracket where it meets the trunk. Smooth it with a wet finger and allow it to cure per the product instructions before driving the car.

Check the installation again after your first drive. Vibration during driving can sometimes shift components slightly. Retighten any bolts that have loosened and reapply sealant if necessary. After 50 to 100 miles, do a final inspection and tighten bolts one more time if needed.

Removing a factory spoiler first (if applicable)

If your vehicle has a factory spoiler and you are replacing it with an aftermarket wing, you must remove the spoiler first. Most factory spoilers are glued to the trunk lid with strong adhesive tape. Use a heat gun or hair dryer to warm the adhesive for 30 seconds, then gently pry one corner of the spoiler with a plastic pry tool. Work slowly around the perimeter, heating and prying, until the spoiler lifts free.

After removal, scrape off the old adhesive tape with a plastic scraper or old credit card. Do not use a metal scraper — it will scratch the paint. Clean the area with rubbing alcohol and let it dry completely. If the factory spoiler was bolted rather than glued, straightforward unbolt it and remove it. Some vehicles have both bolts and adhesive, so check underneath before assuming it is only glued.

Frequently Asked Questions

Do I need to remove the trunk lid to install a rear wing?

No. Most rear wings bolt to the trunk lid from the outside, and you can tighten the bolts from underneath without removing the lid. Removing the lid makes access easier but adds time and requires a helper to avoid dropping it. If your vehicle has a power trunk, disconnect the latch before attempting removal.

What if I drill a hole in the wrong spot?

If the hole is small and not yet used, you can fill it with a two-part epoxy or plastic filler, sand it smooth, and repaint. If the hole is already bolted through, you have two options: drill a new hole in the correct location and fill the old one, or move the wing to use the existing hole. Either way, fill and paint the old hole to prevent rust.

Can I install a rear wing on a car with a factory spoiler still attached?

Not without removing the factory spoiler first. Two aerodynamic devices stacked on top of each other will not work correctly and will look unbalanced. Remove the factory spoiler, clean the trunk lid, and then install the aftermarket wing.

How tight should the bolts be?

Use a torque wrench and tighten to the manufacturer's specification, which is usually printed in the wing's instruction manual. If no specification is given, 15 to 20 foot-pounds is a safe starting point for most 8 mm bolts. Over-tightening can crack the trunk lid; under-tightening allows the wing to vibrate and loosen further.

Will a rear wing affect my car's fuel economy?

Yes, most rear wings increase aerodynamic drag, which reduces fuel economy by 1 to 3 percent at highway speeds. The effect is more noticeable on smaller cars and at speeds above 60 mph. This is a trade-off for improved handling and downforce, especially on a track.