Bouncing off something Gollevainen said about the PLA not trying to develop a twin engine 4th generation fighter, here is suped up J-8 with a few 4th generation charactristics:
* Twin fins and ventral fins
* Double delta wings
* Semi-recessed PL-11s (/PL-12s) under engine intakes
* Redesigned intakes
* Bubble canopy
I then tried a 5th generation revamp using the J-8 as a base. Keeping the same tail planes (minus the tip bullet fairings) and leading edge sweep, the rest is pretty much completely different:
* Twin fins and ventral fins
* Double delta wings
* Semi-recessed PL-11s (/PL-12s) under engine intakes
* Redesigned intakes
* Bubble canopy
I then tried a 5th generation revamp using the J-8 as a base. Keeping the same tail planes (minus the tip bullet fairings) and leading edge sweep, the rest is pretty much completely different: