Quick recap of every noob question. Start with springs or an intake. Best bang for your buck is susension modifications. This car loves the twisties. COBB is in Alpha testing for the Gen2 Speed3. So that will soon be best bang for your buck. The transmission clicks/knocks sometimes. The rear motormount is a bit weak. Cruise control will stay engaged but not maintain speed in a hilly area. That's about it. Enjoy your car. I really love it. And everyone has something nice to say when they see it. Welcome to the Mazda community.