Have decided that these cars need the side scoops and quarter window scoops; I'm looking at the Crevinis brand as they seem to be the closest to the original style. I know some of you have installed these; could anyone advise how they have held up and if there are any problems with adhesion to the car? Also, are these scoops open or closed and do they cause any increase in noise? Sorry for being long winded. Thanks in advance for any help.