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Unlike older vehicles that used a distributor to fire the spark plugs, modern cars have coil packs that sit on top of the spark plugs and provide a direct source of power. Upgrading these can wait until the point where you are running so much boost that it takes more power to just light the fuel off in time. Doing this upgrade on a NA or lightly modded turbo will yield very little in the way of power or better drivablity. If yours are malfunctioning then by all means fix the problem but if you are looking for more power, look else where, like the "destroying the world in a Z32" sticky. I'm trying to get more info like this in there but its alot of stuff to add.
Welcome to the Past Z forum.
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1989 240SX Fastback. . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 300ZX Twin Turbo
Warning: Objects in mirror aren't as fast as they thought they were.
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