no cap for the 4.0 by MSD, i think Auto zone sells a "performance Cap" its thicker than the stock cap. i have a 6AL box with Wires and a Blaster Coil. I feel the power, but its not anything crazy. haven't realized if it was worth the money yet
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no cap for the 4.0 by MSD, i think Auto zone sells a "performance Cap" its thicker than the stock cap. i have a 6AL box with Wires and a Blaster Coil. I feel the power, but its not anything crazy. haven't realized if it was worth the money yet
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