Hmmm... I put new MSD plug wires on when replacing my plugs last time. They were kind of difficult to get seated all the way but I was able to get them on without trimming. I dont know what motor you're running, I've got a 360. The ends of the boots are only rubber though, no important pieces at the end so I Imagine that nothing would be hurt by trimming them. I would suggest using an exacto knife or something similar though to ensure a clean, straight cut to maximize their effectiveness at staying sealed
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