is it possible to mod a front lip spoiler for a 89-90 240sx onto a 91 240sx?. how?...would it be hard?...would it be worth the trouble?..

it should just bolt right on there, no big deal.... all the mounting holes SHOULD be in the same spot and if they weren't i can't imagine it would be too hard to make it work nicely.

Yes it will fit, it's the same car/chassis so everything will be the same as a 91 and up S13

It might look funny cuz you might get a gap where the '91 has the air dam wide open and the 89-90 has a split dam.