Currently the SSC Ultima Aero TT... For the love of god this question comes up every 5 minutes and people still respond wrong.
Also, there are a lot of other variables here. The SSC Aero is the highest top speed production car but the Caparo T1 has a faster Accelleration, as does the Ultima GTR (even though it's technically a kit car, you can buy a pre-built version from the factory). There are a few modified cars that will do above 250mph as well.
everyone forgets the Koenigsegg CCX... it does 254+ mph... hasn't been topped out yet. and yes this question keeps coming up and people keep answering wrong... IMO the veyron is an ugly looking car and as fast as it is its far too expensive.... i'd rather have a few Nissan Skyline R34 V-Spec II's and some STi's and some '09 Ford Focus RS's instead. and i'd STILL have money left. but whatevs someones gotta like the veyron.
For the last time....... 1. SSC Ultimate Aero TT (256.18 mph) 2. Porsche 9ff GT 9 (254.77 mph), Koenigsegg CCXR hasn’t been tested, but claims to do +254 mph 3. Bugatti Veyron (253.81 mph)