Can anyone name some overlooked decent sporty 2 door or 3 doors that time has forgotten...

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If you can find one, early 90s High output Quad 4 cars are god-tier

is the nissan nx 2000 forgotten enough?

It was forgotten because its junk

Came with an SR20 in some markets, and that's about all the good that can be said about it.
That and it looks kinda neat.

242 Turbo
4
2
T
u
r
b
o

Very rare in the American northeast, but very robust motors with cheap parts and simple modification, fairly active community and if you throw a few grand at it you can get ~280hp and have a total RWD turbo sleeper, diff + trans may need to be replaced, but BW T56 trans are often used in swaps with this model.

I don't think any volvo is a sleeper anymore

Mitsubishi Starion / Chrysler Conquest

I've never seen a fast volvo in person
A friend of mine has a 400whp saab, but spins in third and fourth because narrow tires/stock diff/ff