It has guns
The FS-X is quite similar in appearance to the F-16, but structural modifications include:
Japanese-designed co-cured composite wing of greater span (1.7m wider) and root chord, with slightly less leading edge sweep. The composites give the wing added strength while reducing the weight;
increased span tailplane;
slightly reshaped and enlarged radome and forward fuselage (fuselage length has increased by 0.5m);
slightly altered Leading-Edge Root Extensions (LERX).
Overall, the FS-X is substantially larger than the F-16, resulting in a maximum take-off weight of 49,000lb, compared to the F-16C's 42,000lb, although both are powered by the same 129kN (29,000lb)-thrust General Electric F110-129 turbofan engine. Other FSX structural-design changes include radar-absorbent material (RAM) applied to the aircraft's nose, wing leading-edges and engine inlet, the use of titanium in the tail and fuselage, the addition of a braking parachute and a two-piece canopy reinforced against large bird strikes.
The primary difference, although less conspicuous than the structural modifications, between the FS-X and the F-16 is in the use of Japanese domestic technology for much of the avionics, including:
a new Mitsubishi Electric (Melco)-designed active phased-array radar comprising 800 3W gallium-arsenide transmit/receive modules;
Yokogawa LCD multi-function display (MFD);
Shimadzu holographic head-up display (HUD);
internal Mitsubishi Electric integrated electronic warfare system;
Japan Aviation Electronics laser inertial-navigation system backed-up with four conventional gyros;
Japan has also been forced to develop its own fly-by-wire software by the US Government's refusal to release the F-16s computer source codes. The FS-X's software is based on MHI's control-configured vehicle (CCV) research program flown in the early 1980's using a modified Mitsubishi T-2 trainer.
Will the Norkies come up and play with the JSDAF?
Nah! They would be nuts!
Source:
http://www.airforceworld.com/fighter/eng/f2.htm