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1990 Celica GTS
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Nop. Ignition upgrade won't gain anything unless the old one is failing. Stock wire is good for most case. The thicker wire just got thicker insulation to prevent cross fire with higher voltage. Even with MSD, stock wire still provide enough insulation.
 

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the only thing that is good things about more expensive plug wires is:

1. thicker insulation (pineapple said)- causes less cross signal amongst the wires

2. if they are silicone or carbon core. carbon core tends to crack or get weak in place as time and use progresses. Silicone has the ability of flexibility and the life span will last longer.
 
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