Skyline R31 with RB20DE and RB20DET engine Cefiro A31 with RB20DE and RB20DET engine Laurel C33 with RB20DE and RB20DET engine - R31 / HR31 Skyline - A31 Cefiro - C32 Laurel 300ZX Z31 / Fairlady Z Related Part #s - 22433-59S10 - 22433-59S11 - 22433-59S12 - Improved Combustion - Increased Ignition Performance - Improved throttle response and smoothness - Smoother idle - Eliminate engine misfires and hesitation - No spark blowout at higher boost - Direct Bolt in part / No modifications required - Solid construction - 2 Year Warranty - MEETS OR EXCEED OEM PERFORMANCE Brand New in Box