The Show or Display list includes a 1997 Porsche GT1 Straßenversion, and a 1998 Porsche GT1. According to Wikipedia, twenty five 1997 Straßenversions were built, only one 1998 GT1 "street version".
Under 500 cars, technologically significant, meets the requirements for Show or Display. The 1998 Porsche GT1 would still need to meet US EPA requirements, but being based on the Porsche 3.2 twin turbo engine, makes the job of certification easier.
"Regulations for the GT1 category stipulated that to be eligible, a total of 25 cars must be built for road use. Porsche developed a fully road-legal version, dubbed "911 GT1 Straßenversion", and delivered one in early 1996 to the German government for compliance testing, which it passed. The engine had to be slightly de-tuned to meet European emissions laws, although its 544 PS (400 kW; 537 hp) and dry weight of 1,150 kg (2,535 lb) proved to be more than adequate; the vehicle could accelerate to 100 km/h (62 mph) from a standstill in 3.9 seconds on its way to a top speed of 308 km/h (191 mph)."
"For the 1998 season Porsche developed an all-new car, the 911 GT1-98. Designed to match the also new Toyota GT-One and Mercedes-Benz CLK-GTR, the 911 GT1-98 featured bodywork which bore more of a resemblance to traditional sports-prototypes than the previous 2 models while a new sequential gearbox was installed. As per the regulations a street-legal version of the 911 GT1-98 was spawned, but it is believed that only one variant was produced which was still sufficient to satisfy the regulations."
HOW YOU MAY APPLY FOR PERMISSION TO IMPORT
Your signed application must include, at a minimum:
1. Your name, address, phone number, and FAX number.
2. Vehicle identification – make, model, model year, VIN or chassis number, engine number, date of manufacture and mileage.
3. Location where you will store the vehicle in the United States.
4. Statement describing use on the public roads, if intended. If on-road use is requested, identify the Independent Commercial Importer (ICI) that will modify the vehicle to bring it into conformity with the requirements of the Environmental Protection Agency.
5. Basis for the application.
1. Photographs – ¾ frontal, ¾ rear, interior, odometer reading and special features (if appropriate).
2. Document from manufacturer or recognized historical source, identifying total production (production verification).
3. Proof of insurance conditioned on limited on-road use (not more than 2,500 miles accumulated in any 12-month period).
4. Identification of vehicle’s:
1. Technological significance – You must identify (be specific) the technology, engineering, and construction features of the vehicle that are advanced and of an unusual nature not commonly found in motor vehicles manufactured in the same time period; or
2. Historical significance – You must identify the historical significance of the vehicle. If a person of historical significance owned the vehicle, you must submit proof that this person owned the vehicle. If the vehicle was the first or last vehicle of a particular model, you must establish this through the manufacturer’s documentation or, if this is not available, through a recognized historical source. If the vehicle was "one of a kind," you must establish this also.
Items of significance must be numerically listed followed by the reason why the item is of significance.
You may then mail the application to:
Office of Vehicle Safety Compliance (NVS-223)
National Highway Traffic Safety Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
A vehicle eligible for Show or Display may receive NHTSA approval to be driven on the highway. The odometer must not register more than 2,500 miles in a 12-month period. NHTSA approval of limited on-road use is to allow the vehicle to be driven to and from nearby displays of similar automobiles. Another reason permission is granted is to maintain the vehicle’s engine, braking, lighting, and other dynamic systems in good working order. The vehicle is still required to meet EPA requirements. If the original engine in the vehicle will be replaced with a non-original engine to meet EPA requirements, it must be identified in your application since it may impact on the technological or historical significance of the vehicle.