The point of this thread is to gather information from various high speed tests, but they must not be claimed (!!), the point is that they are official
*There's a Road & Track article which features about 8 vehicles, one being the Ruf CTR, anybody have the article? Can't find it anymore
Anyways this is just for starters
402 km/h - Bugatti Veyron (AMuS)
389 km/h - Bugatti EB110 SS (Sport Auto)
388 km/h - Koenigsegg CCR (Pubically Proven)
387 km/h - McLaren F1 (Pubically Proven)
381 km/h - 9ff Porsche T6 convertible (Autobild)
373 km/h - MTM TT Bi-Moto (AMuS)
370 km/h - Sportec 911 SPR1 (Autobild)
366 km/h - Brabus CLS V12 Rocket (Autobild)
356 km/h - Brabus EV12 6.2 BiTurbo (AMuS)
355 km/h - Ferrari Enzo (AMuS)
350 km/h - 9FF Carrera 4S Cabrio (AMuS)
349 km/h - Brabus CLS V12 Rocket (AMuS)
347 km/h - Jaguar XJ220 (AMuS)
344 km/h - Hohenseter H4 HS650, 650 PS (Autobild)
340 km/h - Lamborghini Murcielago LP640 (AMuS)
340 km/h - RUF CTR (1987)
340 km/h - Pagani Zonda C12S 7.0 (Sport Auto)
338 km/h - Mercedes-Benz SL65 AMG (AMuS)
335 km/h - Pagani Zonda C12S 7.3 (Sport Auto)
335 km/h - Ferrari 599 GTB (AMuS)
335 km/h - TechArt GT Street (Sport Auto)
335 km/h - Techart 997 Turbo, 580 PS (Autobild)
334 km/h - Mercedes-Benz SLR McLaren (AMuS)
334 km/h - Porsche Carrera GT (AMuS)
332 km/h - AC Schnitzer Tension, 552 PS (Autobild)
331 km/h - Lamborghini Diablo SE Jota (Quattroruote)
331 km/h - Hennessey Venom 600 GTS (Road & Track)
330 km/h - Ford GT (AMuS)
330 km/h - Lamborghini Diablo 6.0 VT (Sport Auto)
330 km/h - Carlsson SL55 RS (Sport Auto)
330 km/h - Lamborghini Murcielago 6.2 (AMuS)
328 km/h - Lamborghini Murcielago LP640 (AutoBild)
327 km/h - Ligenfelter Corvette C5 383 (Road & Track)
327 km/h - Brabus S600 T13, 620 PS (Autobild)
326 km/h - Ferrari F50 (Quattroruote)
326 km/h - Ferrari F40 (Quattrouote)
325 km/h - Mercedes-Benz SL55 AMG, 2001 (Sport Auto)
324 km/h - Mercedes-Benz SLR McLaren (AMuS)
324 km/h - RUF 993 CTR Sport (Road & Track)
324 km/h - Lingenfelter Corvette ZR-1 (Road & Track)
323 km/h - Bentley Continental GT (AMuS)
323 km/h - HGP Golf R32 Biturbo (Autobild)
321 km/h - Edo Gallardo Spyder (Autobild)
312 km/h - Edo F430 Spyder (Autobild)
320 km/h - Brabus CLK Sport 554PS (AMuS)
319 km/h - Alpina B5 Touring (AMuS)
317 km/h - Aston Martin Vanquish S (AMuS)
317 km/h - Alpina B6 (AMuS)
316 km/h - Aston Martin Vanquish (Sport Auto)
315 km/h - Chevrolet Corvette C6 Z06 (AMuS)
315 km/h - Porsche 996 GT2 (Sport Auto)
315 km/h - HGP VW Golf R32 (AMuS)
313 km/h - MTM Bentley Continetal GT (AMuS)
312 km/h - Ferrari 550 Maranello (Sport Auto)
311 km/h - Alpina B7 (AMuS)
310 km/h - Porsche 997 Turbo (AMuS)
310 km/h - MTM Audi A4 Cabriolet (AMuS)
309 km/h - Aston Martin DB9 (AMuS)
309 km/h - Ferrrari 456 GT (Sport Auto)
307 km/h - Lorinser CL600 (Autobild)
303 km/h - Porsche 996 Turbo (Sport Auto)
303 km/h - TechArt GT Sport (Autobild)
300 km/h - Audi MTM S8 (2000 - Sport Auto)
298 km/h - Dodge Viper SRT-10 (AMus)
295 km/h - HKS Toyota Supra MK4 (Road & Track)
295 km/h - Enco Cayenne Turbo (Autobild)
288 km/h - Edo Cayenne Turbo R (Autobild)
281 km/h - Enco Porsche Cayenne Turbo, V8
277 km/h - EDS Vectra OPC (Autobild)
270 km/h - MTM Audi RS6 (AMuS)
246 km/h - Honda S2000 (2000 - Car & Driver)