II Radio receiver. 3 RS-82 rocket rails under each wing. Different shape of spinner. Spinner with external starter chuck. Lowered rear fuselage.
Port wing intake to supercharger round in shape.
2 Schkas machine guns on top of the engine replaced with one larger calibre UBS machine gun on the port side. New windscreen at more aerodynamic angle. Blown movable and rear parts of the canopy. Armored glass at the back of the seat and armored steel head shield at the top. Retractable tailwheel with small door at the front.