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Originally Posted by Isamu
that's not entirely true bro. The 3000GT VR-4, The Supra TT, the 300ZX TT, the Skyline GTR all made above 276..infact most of them had right around 320... minus the ZX.
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You are right that there were exceptiions, but in general the manufacturers kept to their agreement. They had higher horsepower models built for their racing series. Also, there were some special "one-off" versions of some of the cars that exceeded this limit and sometimes the advertised horse power was at that limit, but the actual HP was greater.
Some of the models had "export" versions with higher horsepower -- Supra the mkIV is an example of this.
From wikipedia
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twin turbocharged Toyota 2JZ-GTE making 276 hp (206 kW; 280 PS) and 318 ft·lb (431 N·m) of torque for the Japanese version. For the export model (America/Europe) Toyota upgraded the Supra turbo's engine (smaller, steel wheeled turbochargers, bigger fuel injectors, etc.). This increased the power output to 320 hp (239 kW; 324 PS) at 5600 rpm and 315 ft·lb (427 N·m) at 4000 rpm
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Here's an except from the Nissan Skyline GT-R page on Wikipedia
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In February 2002 Nissan released a final production model of the R34 GT-R called the Skyline GT-R V-spec II Nür and the Skyline GT-R M-spec Nür. The Nür was named after the famous German Nürburgring racetrack, where the Skyline was developed. In total 1000 R34 GT-R Nür(s) were made, 750 were V-Spec II Nürs' and 250 M-Spec Nürs'. The Nür model featured an improved RB26DETT based on the N1 racing engine. The standard turbochargers were upgraded to larger versions with a slight increase in boost and the ceramic blades were replaced with steel versions. This has increased lag, but to compensate the turbo's durability was improved while being able to handle a bigger boost increase. This allowed tuners to increase the boost safely with standard turbos up to 340 kW (450 hp) at the crank. The V-spec II Nür is based on the regular V-spec II model, and the M-spec Nür was based on the regular M-spec model. Other than the addition of the Nür engine, the Nür models also included a different color of stitching on the interior trim, as well as a speedometer reading up to 300 km/h (186 mph). Due to then-current Japanese law the car was advertised as having 206 kW (276 hp) but it actually had over 246 kW (330 hp) when it left factory.
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See also:
http://en.wikipedia.org/wiki/Japanese_domestic_market