[Mr.ac]

Yeah.....that "tracking" guy is a weirdo.
You don't need downforce for our cars. Spoilers, rear diffusers don't make jack. It just looks cool. The truth is our cars are no where near high horsepower and fast enough to require down force.
As for tires, those are shit for "tracking." If you do plan to do some track days I highly recommend buying another set of wheels and tires with a utqg rating of 200 and lower.

You really don't need to buy anything to go for a track day. Just show up with your car in perfect working condition. If you do go, forget your ego, and ask for an instructor to ride with you for half a day. I'll also recommend you go to an autox event first. It's lower speed but more technical and a lot safer. No worries about hitting a wall or off track. All you'll do is just eat some small cones if you mess up.

After that then decide if you want to spend money on this car.

As for switching cars, it means jack. If your a great driver you can out drive anyone in any car. I seen 150 hp mitas out run 500 hp cars. The key is the dude in the miata has been on the track over 100 times where as the dude in the 500 hp car has only been out 3 times.