I'm pretty sure all of them are just stick on, I know the rear intrigue letters are stick on....but they also are indented/recessed into the trunk lid, unlike in 98, where they stuck out and had problems of falling off (weak glue I guess). So, I would leave the rear trunk lid intrigue emblem on, unless you're going to do some body work too!
The rear oldsmobile emblem on the trunk lid, wasn't even there in 98, they decided to put it on in 99, to make sure people knew that it was an oldsmobile
The front hood emblem.....I suppose you could take it off pretty easily, not sure if it's stick on or not, never really looked at it.
I leave all the badges on my car though....I think they look nice
Especially when they are gold
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Brando