actually, compared to drilling, the clips creates more damage to yr hood.. as downforce will push these clips to actually 'eat' into the steel of the hood after it has chew thru the paints...hence, u got a 'larger' surface area exposed to rust...
while driving some days ago, saw at the backlite of toyota caldina with the sticker
"CCM146"...asking my frens what does it mean..and they said that is Caldina Club Malaysia.
The number indicates their membership...