Yes
Do they fit?
Yes
well, 20 inch rims fill the wheel well very nicely - So, I would have to assume that 4 additional inches in diamter would make the wheels rub while rotated at best, if the body is not lifted to accomidate the large rims. (Why would you put 24s on a Charger??)
24inch wit low profile tires
Sure you can.
yeah but why
yes
6.1L Hemi
You can put a supercharger?turbo charger on anything. It all depends on how deep your pockets are.
Yes, you can put 20 inch rims on a 2006 Lexus GS 300 as long as the rims have the same bolt pattern as your existing rims. You should be aware though that putting bigger rims and tires on your vehicle can affect the gas mileage.
No, they will not clear the brake calipers.