Go to folder:
...\Car Mechanic Simulator 2018\cms2018_Data\StreamingAssets\Cars\SalemKieran

Open file "bodyconfig1.txt" and replace:

[unmount_with]
door_front_left=mirror_left,window_door_front_left
door_front_right=mirror_right,window_door_front_right
door_rear_right=window_door_rear_right
door_rear_left=window_door_rear_left

[tuning]
hood=hood2
bumper_front=bumper_front3
bumper_rear=bumper_rear3
headlight_left=headlight_left2
headlight_right=headlight_right2
taillight_left=taillight_left3
taillight_right=taillight_right3

Open file "config1.txt" and replace:

[parts0]
name=#IntercoolerM
position=0,0.0985,2.0183
reflection=False
rotation=0,0,0
scale=1

[parts1]
name=#Cooling
position=0,0.2658,1.87
reflection=False
rotation=0,0,0
scale=1

Run game, go to Showroom and select Salem Kieran Turbo. If goes wrong let me know.

Shame Red Dot Games :(