A few tips from my side :
-place 2 big wooden boxes having 4 jumbo sized Woofers in your trunk.
-4 big batteries for your music system.
-a heavy body kit.
-huge bumpers.
-softer suspension.
-big heavy exhast that can add atleast 20 kgs of weight + bhaaaaaaaaaaan bhaaaaaaaaaaaaaan sound.
-4 big loud speakers with 4 microphones for each passenger.
-more dials inside the car, they should be in steel with a fake coating of carbon-fiber.
-heavy cables for the sound sytem and for the plugs (they should atleast weigh a good 10 kg)
-1 kg stickers.
-1 to 2 kg of tints.
And you are done, your evo is ready 