Some throttle body spacers have what look like "threads" on the inside, or even curved veins. The theory here with this style of design, is that it creates a whirlwind effect to the air, making it...
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Some throttle body spacers have what look like "threads" on the inside, or even curved veins. The theory here with this style of design, is that it creates a whirlwind effect to the air, making it...