Patriot Performance Heavy Duty Plug Insert For Heads. These help by installing a heavy duty plug insert for hte spark plugs to help stop spark plugs from blowing out the heads which happens on stock heads.
* Please note that there is a shipping discount on multiple items in the same order(excludes oversized items). The shipping amount here reflects a 1 item/part purchase. Shipping price reflects shipping within the contential US. All other locations extra.
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