I ordered this as part of a conversion project to a Legacy STI S402. the part arrived well packaged, with hardware, template, and instructions. It's an unpainted part so be prepared to either have an auto body shop paint it for you or invest in prep material to do-it-yourself.
You will also need an electric drill with 3mm, 7.5mm, 8mm, 10mm, 15mm hole saw, torque wrench, measuring tape, scissors, touch-up paint, white gasoline (or similar to clean surface of any natural body oils while handling), rags, newspaper, masking tape, clip remover, file.

- Before the final installation of the spoiler, it requires to be painted and finished first.
- Inspect contents of package to ensure proper quantity of items.
- After painting, remove the masking tube and install the small packing.
- Install the slide bolts (3 places)
* Insert the slide bolt until you hear a click.
- Attach the clips (2 places)
*Insert the clip until you hear a click.

HIGH MOUNT STOP LAMP INSTALLATION
- Install the large packing in the large hole near the STI logo.
- Pass harness for the high mount stop lamp into small hole and out through larger hole that has large packing.
- Insert grommet of wiring harness through small hole to secure.
- Pull high mount stop lamp harness through until black vinyl tape is seen then secure lamp to spoiler with two screws. (tightening torque 1.5N * m)

TRUNK LID HOLE DRILLING

- Open trunk and remove the interior trim on the back side using a clip remover (12 clips, 2 rubber feet)
- Place the template on the trunk lid and secure it with masking tape.
- Place the top of the template 200mm from the top of the trunk lid.
- Be careful when aligning the pattern.
* To make it easier to fitthe pattern, cut it out using scissors along the outer lines.

- Use a punch to mark the seven holes on the pattern.
- Wrap approximately six rolls of packing tape around each drill bit at a distance of 5mm from the tip, and around 20mm from the tip of each hole saw
- Remove the template and drill a 3mm pilot hole at the mark made from the seven punch hole marks.
CAUTION: The drilling surface is angled downwards, so work carefully to avoid misalignment.

- Dril a hole to the diameter indicated on the template. 7.5mm, 8mm, and 10mm require a drill, and 15mm requires a hole saw.

ATTENTION
- Before drilling, lay newspaper inside the trunk to prevent debris from flying out.
- Remove burrs from each hole with a file.
ATTENTION:
- Be careful not to widen the grommet hole (8mm)
- Be careful not to cut your hands when removing burrs.

- Place the spoiler temporarily on the trunk and check that the bolt clips fit into the holes in the bodywork.
- If the position is not correct, adjust it by sliding the bolts and clips.
- Use air blow to remove chips.
- Open the trunk and remove the newspaper to prevent chips from falling.
- Carefully wipe the shaded area with white gasoline to degrease it.
- Apply touch-up paint to the drilled area to prevent rust.
- Apply touch-up paint to the D-holes, let them dry thoroughly, and then install the grommets
- Make sure to insert the grommet firmly so that it does not float.
- Peel off about 5-10cm of the pickup tape on the spoiler body
- Peel off tapes closest to stop lamp.
- Pass the spoiler side harness through the 15mm hole.
- Install the spoiler on the trunk by pushing the clips on both ends into the grommets until you hear a click.
- Temporarily fasten the four bolts on the spoiler body with nuts.
- Pull off the remaining pickup tape and press the spoiler body.
ATTENTION: The pickup tape will break if pulled too hard, so please peel it off slowly.
- Fully tighten the loosely fastened nuts (tightening torque: 6N1).
- Press the spoiler body again to firmly press the double-sided tape.
- Open the trunk and insert the spoiler connector into the 20 holes in the trunk lid, then connect it to the free connector on the trunk lid. Fold the excess cable and tie it up with a band.
- Replace the trunk lining.

Treatment of high mount stop lamps:
- Disconnect the negative battery cable.
- Remove the high-mounted stop lamp from inside the vehicle by pushing it towards the rear of the vehicle.
- Remove the base and lens from the back of the stop lamp and remove the bulb inside.
- After removing the high-mount stop lamp, thoroughly clean the lens surface then attach the included cover sticker.
- Install the high-mounted stop lamp in its original position inside the vehicle.
- Connect the negative battery cable, apply the brake and check that the spoiler side brake light comes on.

Product quality looks great! very precise with all the installation parts. Excited to get it installed.