For 6 cylinder engines, anything below 2.5L will be weak.
If it must be a 2L, go for the SR20DET. If you like the sound of 6 cyliners, at the very least, an RB25DET.
Just think, all the 6 cylinder 2L, NA or turbo, are there any trully fast ones?
Eterna TT
Perdana V6
BMW 2L inline 6
Cefiro
And...