Nissan S13 & S14 Red Top / Black Top SR20DET SR20 - Improved Combustion - Increased Ignition Performance - Increased BHP and economy - 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 Coil / Coils in box.