G-Power has introduced a lot of performance packages for the current BMW 550i, 650i, 750i, M5 and M6.
First, the 50i models can be boosted by the Bi-Tronik III package, which can increase the power to:
- 490 HP (360 kW) and 685 Nm (505 lb-ft)
- 510 HP (375 kW) and 720 Nm (530 lb-ft)
- 540 HP (397 kW) and 790 Nm (582 lb-ft)
- 560 HP (411 kW) and 810 Nm (597 lb-ft)
The pricing starts from €2,999 (excluding VAT).
Second, the M5 and M6 can be also boosted by the Bi-Tronik III package:
- 625 HP (459 kW) and 777 Nm (573 lb-ft)
- 645 HP (474 kW) and 810 Nm (597 lb-ft)
- 680 HP (500 kW) and 890 Nm (656 lb-ft)
- 710 HP (522 kW) and 890 Nm (656 lb-ft)
- 740 HP (544 kW) and 910 Nm (671 lb-ft)
The pricing starts from €2,517 (excluding VAT).
The results are thanks to a number of upgrades including ECU re-map, bigger turbochargers and complete sports exhaust systems.
The choice is up to you!
Source: G-Power
Tuning house 
AC Schnitzer has revealed their tuning program for 2011 BMW 550i F10. The project is called ACS5 Sport S and will be exhibited at the Geneva Motor Show in few days.
BMW 5 series has almost 40 years of history and nearly 5 million models sold accross the world. It probably the best car in executive saloon sector, which combines awesome handling, satisfying performance, nice elegance and luxury.