The B3 GT3 limited edition isn't the only Alpina making its debut at this week's 2011 Tokyo Motor Show as the boutique automaker also brought along the coupe version of its B6 BiTurbo based on the latest BMW 650i.

Alpina has taken BMW's 4.4-liter V8 turbo engine to the next level with a series of upgrades including an intercooled dual turbo system and the addition a new titanium exhaust system developed in conjunction with exhaust specialists Akrapovic, that all help to lift output to 540-horsepower at 5,500 rpm and peak torque to 700Nm (516 lb-ft).

Famed BMW tuning house Alpina showed up at the 2011 Tokyo Motor Show with a world premiere, the limited edition B3 GT3 of which only 99 examples will be built, each carrying a price tag of €90.000 (approx. US$120,000) in Germany.

The B3 GT3 is based on the regular 3-Series Coupe and it uses a slightly modified version the 3.0-liter twin-turbocharged inline-six found in Alpina's B3 S Bi-Turbo sedan, coupe and touring models.

Thanks to a different exhaust system and a titanium rear silencer made by Akrapovic the three-liter unit gains 8 more ponies lifting output to 408-horses at 6,000rpm and 540Nm (398 lb-ft) of torque at 4500rpm.

The pride and joy of the Alpina stand in Frankfurt is the new B6 Bi-Turbo Cabrio based on the new BMW 650i Convertible.

The German tuning house has beaten its factory support to the punch with a high-performance version of the roofless 6-Series that boasts an uprated 4.4-liter twin-turbocharged V8 engine generating 507-horsepower and 700Nm (516.3 lb-ft) of peak torque between 3,000 and 4,750 rpm.

For more than four decades now, German tuning house Alpina has been modifying BMWs cars. The Bavarian luxury carmaker has a tight relationship with the tuner going as far distributing the high-performance models through its official network.

Alpina's newest creation is the B6 Bi-Turbo Cabrio based on the latest 6-Series Convertible, which will make its world premiere at the rapidly approaching Frankfurt auto show on September 13.