You might even want to do a little work on the old girl to get her to perform a little better after you auto -x . I'm running a 24 year old tacoma with 260K and drive it like I rented it .Go have fun .You will have one of the coolest cars there and when your done have someone take a pic of you big smilling face and post it here! High 5's all around , golf clap!
WHAT you are driving is not going to matter until you have learned to find and drive the course.
In order to be quick you have to find your way through the sea of cones and be thinking a corner or two ahead. A lot of newcomers never get past the sea-of cones stage. Still a lot of fun to go out and try. ANY car will work for this early stage.
The course is learned at the start of the event by walking it. I would suggest that you attend the next event early enough to do the course walk and see if it makes sense to you. Since autocross people are some of the nicest people in autosport, you are bound to find someone who will walk you through the whole thing.
If the odd oil drip were an issue, there would be no brit cars on course ever.
This is the first local spot. Hard to tell but there are really tall light poles with large cement bases in the parking lot. The runs on Sun seemed to go around this big poles with a a wide turn. Spectators were along the edges of the parking lot in the grass.
This is the other location. It's about 45 mins from my house. I don't know how it is setup over there.
I agree with all sentiments here--the 911 will be fine, and you'll probably spend a larger portion of your time sitting, lost on the course, with an instructor in the car helping you get back on course than actually driving at speed. 
Oh, yeah, novices are offered instructors--usually--so take one with you. Maybe somebody will bring you for a ride in their car--do that, too--ideally before your run.
I've only ever heard of a couple accidents in my region. Usually as the result of a mechanical failure where someone lost brakes or similar. I know last year there was that tragic incident where someone had a stroke I think while in-car on course. Of course some groups are more limited by their sites. I've seen some sketchy courses on you tube. FWIW if you're worried you can get autox insurance really cheap, like $300 a year.
https://locktonmotorsports.com/autocross-off-track/
I started autocrossing 12 years ago and at my first event was DFL. I backed up, evaluated what I wanted from the sport and bought a Miata. Now I generally flog the Zoomboni around any course available and it's clearly my obsession.
Everyone have to have something that gives them drive and purpose, autocross is what does it for me.
Find a Yaris, cheap to run and when set up right can really hand contemporary performance cars their own butt, last few times Ive ran my Yaris, I was faster then a GR Corolla and CTRs by over a second. My buddy in the supercharged NC we are always neck and neck. My car is pretty basic as its my daily/back up race car.
But really you can run nearly anything. Now some classes do require tagged cars, but that wont really be enforced until you become competitive. Id say run the porsche a few times first and get the feel for things. Normally you only shift once, into 2nd gear. Thats it. AX is essentially 2nd gear parking lot time attack and its very addictive ❤️
Other groups might differ, but scca doesn't require anything to be street registered. Capable of being registered in some categories, but not actually *being* registered.
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