PC, If you are going to replace your hood lettering you should look into the LR3 hood lettering. I've seen others that did this and it looks great! The lettering looks more like metal instead of vinyl... I heard they were $60 from the dealer, I paid that for the raised vinyl one!
As far as getting the old adhesive off - I used TR3 compound and it took it right off. If not Goo-B-Gone should do it. I would be sure to rinse it really well and then wax it.