#3 is correct. That's what I've read and keeps the engine noise down a tad. I've also heard #1 being the purpose, and I kinda lean to that as well, cuz the primer on my hood cooked off in a cpl months.
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2019 Toyota Tacoma TRD Pro ... M6, Voodoo Blue Fun Machine
1987 Pontiac Trans Am ... 305 TPI, T5, Project Car
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