It is a 325i. There are places where I can tell but its hard to explain. Well the easy one is, look at the trunk lid handle. It has matte finish which means its plain black. That can tell you it is a 325i.
Another thing is the front bumper. He kept the stock bumper and added Hamann spoiler lip.
On the bumper you can see small elipsoid fog lights and full black lower air dam. 330i (without sport package) comes with this fog lights, but it has different lower air dam.
See photos.