The RB26DETT is a 2.6 liter twin turbocharged inline-6 cylinder engine produced by Nissan between 1989 and 2002, Officially producing 276BHP although the engine actually produces around 335BHP, The RB-26-D-E-TT (RB-2.6 liret-duel overhead cam-fuel injected-twin turbo) was used in multiple vehicles including of course the Skyline GTR R32, Skyline GTR R33 and  Skyline GTR R34 but less famously the Sentra 260RS.
it is common to reach 600BHP using stock engine internals and the engint is able to reach outputs of over 1300-1400BHP with extreme modifications,   stock variants rev to  6800 rpm and produces 289 lb·ft of torque at 4400 rpm