fernandolens...just wanted to mention there's a $3 solution if you don't want to cut the wiring. you can keep everything reversible maintaining stock connections and it literally takes 5-10 minutes.
once you have the oem spoiler unbolted, the wiring is long enough for you to turn it over and lay it down on the trunk (use some towels). remove the oval cover caps (5) to access the screws for removing the led bar and pull it out just a few inches.
once it's out, disconnect the plug and then reassemble the led strip and oval cover caps and you're done with that.
now that you've pulled the wiring all the way out from the spoiler, you're left with a female two-pronged connector that's coming out of the trunk lid.
pick up some of
these male connectors at your local auto shop (pep boys). crimp these onto the wires of the aftermarket spoiler (i recommend soldering) and insert them into the female connector...they will fit very, very snug and won't budge.
note: make sure you match red/red and black/black (test light if you're not sure).
wrap or shrink the whole connection, tuck the wiring into your new spoiler and you're done!
Part: Male GM 150 Metri-Pack
Part No: 85336
Manuf: Dorman
Size: 20-18 Gauge