Just got my Sterckenn yesterday, can't wait to install it soon, but the instructions were missing.
It was truly packaged with nuts and bolts with washers which is kind of odd and it looks like i will need loctite as the nuts don't have the rubber
ETA: just got emailed the instructions from Sterckenn, and as I thought it is more involved to install with drilling 15 holes in the bumper than other lips I've installed in the past and was basically plug in play. But the quality and finish is equal to OEM M Performance as they're both made in Europe