Tiles now affect neighbouring tiles in a cross shape when placed:
Clutch: +0.1 tb
Gears: +2% km/h
Fuel: +30 kW
NOS: +0.1 nos
Tireboost: +0.1 tb
Weight: -1% kg
Lighter Pistons: +2% kW
Turbo: +30 kW
Beefy Block: +50 or +2% kW
Money Pit: +5 v$
Update 7
Source: Steam Community (opens in a new tab)