Just did the install with friends today. The DIY helps but the wheel arch is definitely the most confusing part.
1. E90 325i/328i/330i Eisenmann Race Exhaust 2 x 76mm (Used for 30000 miles) $680 OBO
2. BMW M3 Steering wheel $430 OBO
3. BMW Original E90 Blacklines $230 OBO
4. BMS Powerbox $230 OBO