This is a record of my current M2 modification situation. Perhaps some G8X owners will find my rambling notes helpful and avoid some pitfalls.

No.1: Let me first mention what I consider the most important modifications to my car: AIRFLOTT suspension, a full set of 55 Racing titanium alloy struts, 6269 front and 9449 rear brakes, some aerodynamic kits, the interior trim (which probably weighs several tens of kilograms after removal), a CS ECU tune, and some less important personal touches such as a steering wheel, carbon mirrors, carbon hood, carbon fenders, and a trunk lid. I haven't removed the sound system; it can't interfere with my music listening. These are purely based on personal preference.

No.2: Modification means breaking the balance to pursue a new one. This may require a lot of effort and money. If you don't truly love it, there's no need to go to such extremes for a little bit of lap time. For example, the stock suspension and brakes of this generation of G8X are actually quite sufficient. Even on the track, these modifications only extend its performance window. The brakes, which could only last one lap before, can now last one and a half or two laps. The stock suspension can also support most curbs. For a street car, I personally think this is quite satisfactory. On a side note, I've seen many G8xes used for track and mountain driving, and many people have only modified the basic calipers and suspension. I think it's better to replace them with better brake pads and tires, and remember to ensure proper cooling. I don't know what those vendors are thinking, recommending things that are inferior to the stock. You need to be discerning; some mistakes can't be avoided just because I advise you.

No. 3: A lot of work was also put into the chassis data. Camber, toe, caster, track width, wheelbase. These all need to be adjusted according to your own driving scenarios. Different tires and different driving scenarios may result in different data, which is very complex. Simply put, find a general data that suits you, then adapt it to the car. Then make fine adjustments. Some manufacturers will recommend basic data to you; if not, you'll need to search online, ask other car owners, or visit dealerships. This will save you a lot of effort. During this process, I've noticed many people are reluctant to share this information. This might be because the data is complex and highly customized, or because they feel it's too important to share.