before I start, I would like to know if the badges are stickers or do they have a bolt through the body. thanks

Since you don’t tell us which year Impreza you’re talking about I’ll try to cover all.

The center trunk badge on the ‘06/’07 is through the trunk lid, the other badges are attached with double-sided tape.

Use a hairdryer on a medium setting to soften the adhesive and then slide a piece of thread or similar behind the badge to lift it off. Once the badge is removed use Goo Gone to clean up the residue.

I debadged the trunk on my car, it’s 30 minutes at most.

sorry, I forgot to say that I have an '02. also does anyone have a printable template for the opening of the stock hood scoop? I would like to put a grill in there.

No template that I know of for the hood scope area, but if I may request, please don't put a grille in there.