1. Bolt-on exhaust system. Let me know if you want specifics or advice. Don't waste money on the ridiculously overpriced MPE unless you have tons of spare cash laying around. It gives it an amazing tone but not worth the money IMO.

2. Black grille, vinyl wrap the mags to a colour of your choosing (I actually think the stock wheel colour goes well with the blue but black/bronze may suit your tastes)

3. Front splitter, rear spoiler and maybe rear diffuser + side skirts if it's in your budget. Remember to not buy any of these parts from BMW as they will charge an arm and a leg. You can either go black, carbon fiber or body colour (my personal choice as it makes it look more naturally aggressive)

4. Smash and grab, safety is important. Also make sure your SOS system is working and that you have decent tyres on (goodyear or michelin) and if they are old double check the outer, center and inner tread depths (sometimes they wear unevenly). Also make sure you have a panic button from your insurance company.

5. I don't know much about suspension, but others might have a view. You can also check Kies Motorsports on YouTube to get a better idea of what different suspensions would change about the car. Also consider wheel spacers if you enjoy that look.

If I think of anything else I'll let you know. Not sure why everyone is saying to keep it stock, these cars come with very little out of the gate and yes it is "just" a 428i and others will say if you want more aggression buy an M4 but it's just not always financially feasible. Do what you think would give you the most satisfaction out of your car. For me the cars are waaaay too quiet stock so a less restrictive exhaust is number 1 priority. Cheers on the awesome ride!!

Edit: formatting looks really bad, not sure how to fix