As always my setups are not geared towards ultimate laptime, but keeping the car predictable as much as possible without sacrificing too much lap time.

This text will expand as we learn more about the car and of course the setup and laptimes will get more updates.

Mustang
The car seems to follow what we know of the M4 by fair and large, has the same spring sets, responds similarly aerodynamically, steer ratio seems the same, so I guess we can carry a lot of things over. The dampers seem different though, so there's some more to find out.

Engine wise: long rpm range, you want to go near the limiter (shift 8100-8200), which means not shifting into 6th most of the time. This also offers a few situatons where you dont have to shift at all, whereas other cars have to go up and down between corners.

Short shifting isn't too beneficial, as the power really only comes alive in higher rpms. Though it can help out of slow turns where grip is scarce.

The car has pretty nice TC. Even with TC1 on 3 it barely engages when unnecessary, but it will give you a lot more confidence. So don't shy away from running TC1 on 2, 3 or even 4 in this one, and also cranking up the TC2 setting seems to make it smoother and more reliable - you can easily go up to 7 or 8 here.

Brands Hatch
On brands hatch we have several problems: We have a big heavy car and fast corners going all in the same direction in quick succession without giving the tire a chance to cool. It requires an aggressive setup to create rotation in these (e.g. a bit of negative rear toe), but this poses a challenge for the bumpy exits of the slow turns. Your right foot is the best asset you have on board to mitigate these exits. You can always add more rear bump stop range for traction, but you will get understeer in the fast right handers instead. However, once the car is fully fueled, it turns with ease and also has more traction. Hence the lap time delta from Q to Race is rather small with just 6-8 tenths. 

If your session temperatures are higher than in this reference data pack, increase the brake ducts by at least 1 click. This is already done for the race setup, but also consider it for Q - as the tires quickly go above their window.

Driving
You can drive this like any front engined car. Trail the brakes deep, aggressive throttle in fast corners, but you need to progress a little into it out of slower turns as the torque can be a bit much for the rears. The speed of your steering input will play a role in wrestling the car around in fast corners where it tends to be very stable. The gear shifts are rather harsh on the car, make sure you are not shifting up when the car is in a already sensitive situation.

Adjustments
You can still add more oversteer here by:
- add rear ride height
- stiffer rear anti roll bar
- less rear bump stop range
- more front bump stop range
- less rear rebound damping
- less front anti roll bar

or make it more stable:
- add wing (but also add 1-2mm of rear ride hight with it)
- less bump stop range on the front and more on the rear
- stiffer front spring
- less rear anti roll bar
- less rear ride height
- more rear rebound damping
- less front rebound damping

Do one or two clicks at a time. All of these settings will have side effects in different situations.

Tire wear seems really balanced, so the car might be well balanced over a full stint.