Can't imagine... konting pics naman ng Optra bay, pls.

Most cars with a high front-mounted air-intake have the intake shape molded into the hood, so I don't know how much good it'll do on the Optra or if it will fit.

If the Optra box is anything like the Sentra box (Box near engine, then tube down to front bumper, right?) just get a cone and shield assembly.

And I'd be really interested in how much difference this could make in consumption. One thing you can also do is view the brand new Optra wagon units at the casa and take some engine bay pics to see if there are any physical differences in the intake or exhaust tracts to see what else you can do.