... and shorten the ignition coils magnetization time, increase secondary voltage (12V to rise to 16V), spark growth period, ... for the best engine combustion efficiency, especially for band with adjustable high-performance spark plug engine, for both turbo ... eliminating coke, extend engine life; 6, heat resistance, waterproof design. Universal ignition amplifier engine 3 4 6 cylinder (Black , bule ,red)