When it comes to engine performance, most people focus on the big-ticket upgrades — intake systems, exhausts, camshafts, injectors and ECU tuning. But one part that is often overlooked is the ignition system, particularly the spark plug leads. For a V8 engine to produce consistent power, the ignition system needs to deliver a strong and reliable spark to every cylinder. If the spark isn't consistent, the engine can suffer from misfires, poor throttle response and reduced perf