Is a Nissan skyline faster than Corvette C6?

It depends on which specific models of the Nissan Skyline and the Corvette C6 you are comparing. Here is a general comparison based on the Nissan Skyline GT-R R34 V-Spec II released in 2001, and the Corvette Z06 C6 released in 2006:

Nissan Skyline GT-R R34 V-Spec II

- Engine: 2.6-liter twin-turbocharged inline-six with 280 hp and 289 lb-ft of torque

- Transmission: 6-speed manual

- Curb weight: 3,293 lbs

- 0-60 mph: 4.9 seconds

- Top speed: 186 mph

Corvette Z06 C6

- Engine: 7.0-liter naturally-aspirated LS7 V8 with 505 hp and 470 lb-ft of torque

- Transmission: 6-speed manual

- Curb weight: 3,132 lbs

- 0-60 mph: 3.8 seconds

- Top speed: 196 mph

As you can see, the Corvette Z06 C6 has superior performance overall with a more powerful engine, faster acceleration, and a higher top speed.