i put on 20's staggered on ym 05 coupe, do i need ato get an alignment for the camber issues now?

 

If you only swapped wheels and tires, your alignment parameters have not changed at all. If you put different springs on as well, then yes, you'll need to get an alignment.
-GP-

 

If you put 20s on a stock suspension, then IMO, yes you need an alignment to go with the drop that you need too.

 

Why take the chance and ruin your new tires. I'd just recommend getting it done. Once you chew a tire the wrong way you can't fix it.

 

the way that weight bears down with your new wheels as opposed to your old ones is different.

the fact that the geometry is different to the ground will change the dynamics of your suspension.

you should definitely get an alignment because the surface area touching the ground on your old wheels versus your new ones is probably different not including the difference in offset as to how that weight travels to the ground.