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NGK spark plugs are essential. Don't get the Bosch +4, you need something to keep your engine cool to avoid damage to it. Personally, I think NGK copper or platinum are the best spark plug for any import car.
Spark plug wires aren't as important, especially 'performance' wires. Just get some new wires if your old ones look dingy, because any thicker wire won't create more power. Your stock ignition system is fine until pretty high hp levels.
I would say those people know what they're doing, so follow their directions closely if you plan on going far. Missing a step usually is an engine killer.
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