The GT4 Rear wing is generally conceived as a very good addition to the Lotus Evora.
It will give the car a more racy look than the original spoiler and it does actually add downforce on the rear end.

These spoilers are made from GRP and look absolutely lovely.

You can choose for a spoiler with or without the possibility to install the high level (also called 3rd) brake light.
The actual brake light is supposed to be taken from your original spoiler.
If you have a GTE rear bumper, the high level brake light is integrated in the bumper, so there's no need for that in the spoiler.

The brake light used is the original brake light for the Evora and Evora S, part number C132M0108F. The Evora 400 has a brake light which has different dimensions, so you can't use that on this wing.
Also on the 400, you may have to mill the holes which hold the wing in the tailgate to bring the wing in line with the edge of the rear clamshell.

Weight is based on dimensions, not actual weight.