The Pur Sang (Pure Bred) Veyron has no body paint. Just a pure aluminium-carbon fibre body. It's not faster in anyway.
The Aero's speed is verified by the Guniess Book of World Records though:
"SSC announced they broke the speed record for the world's fastest production car with 255.83 mph (411.72 km/h) in West Richland, WA on September 13, 2007. The reported record speed comes from an average of two runs, one in each direction, in accordance with Guinness Book of World Record rules. The first run clocked 257.41. The return trip came up with 254.88 for the previously mentioned average of 256.15 besting Bugatti Veyron's speed by 2.35 mph (3.78 km/h). The results of this test, verified by Guinness World Records on October 9, 2007, gave the SSC Aero the world's fastest production car title."
http://en.wikipedia.org/wik..._Aero_TT