Quote - i have always wanted to go the old movie route and cut the car in half. I need a modelling app that I can import the OBJ file into, add a cube and use boolean operator to delete the intersection. Any suggestions 

Well, Blender is free and can certainly do this (along with lots of other things) BUT there's quite a learning curve. 

Depending on the mesh it shouldn't be too hard to do the same with Poser's grouping tool. Front view of the car, front camera, wireframe display, select half of the car... 5 minutes, tops :)

Poser's grouping tool is actually pretty good, and not as hard to use assome make it seem ;)

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  Using Poser since 2002. Currently at Version 11.1 - Win 10.