The Maxima is classified in ITR, for the model years 00-01, at 3040.
If you wanted the earlier version classed, you could eamail the ITAC and CRB with a request. include the pertinent data on the car.
I have to say though, that I might think twice about running the car. It had a lot of power, IIRC, and that means it will be classed at a not so light weight. It willl get the FWD and probably some brake compensation, but even still, it's going to be tough to get by the RX-7s and BMWs and other front runners, if it fits in ITS, on 7" wheels. My initial reaction was one of those cars that just wasn't a "fit", but lets get the numbers on it.
I'm not saying it can't be done, and I am all for diversity, but theres a lot of development ahead of you before the car sits on the front row of the ARRC.
If you post some numbers here, maybe we can give you an idea of the class and weight it would run if classed.