Congrats on the purchase!
Many of the popular mods for the cars are
- Upgraded hot pipe
- Axle back (they can be loud, but it does sound good)
- LAP3 Pro-tuner or ECU calibration
- Lowering springs
Overall the car is good from the factory, mine is still relatively stock other than axle back and intake to maintain warranty, but I'll likely get a tune in the future!
SXTH element is one of the better aftermarket companies for this car, performance wise.