haha on a corsa irmsher, well vauxhall do come with that silly plastic underneith which always makes me think they are insulting the parking skills of there drivers or saying there build quality is crap.
Anyway facelift bumper is like mine doesnt matter with the colour coded but or not, mine does have the colour coded bit behind the number plate. baisicly if it has rubstrips on the front it is a pre-faclift if it doesnt then its a facelift with the exception of the cupra bumper obviously.
But if you are using small self tapping screws like the ones outlines in my
guide you wont damage a thing, the hard bit comes in lining it up correctly bending it and cutting it. Easy mod well worth while and if you do screw up and haven't used silly screws a new on is only £17 so not the end of the world.
As for pulling out, yes they can rip out if you are silly low or drive over speed bumps like a twa* but again long as the screws are short they should only pull the screws out meaning an easy fix. I have had mine on for 1.5years and im low as I can go for my sump and mine hasn't come off.