You will need this if you have headers on your LS. I had a standard set of spark plug leads (straight spark plug boots) on my LQ9 when I noticed a slip and 2 burned spark plug leads, even with heat socks on. They had angled spark plug boots, which are a must for most headers. I only had to put on one sock because it was closer to the main than the others. The engine ran much better when all 8 were leaked
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