Hurp Durp: How does one port?

I am wanting to port a car from Burnout Paradise to gmod. Only issue is that I have no idea where to even start. Which is why I turn to you.

Sorry for the short thread, just thought I’d be blunt.

As far as I know you can rip models using 3D Ripper X. Or try to get a model-import plugin/script for 3dsmax or whatever.