Leather Face carb tuning guide - trash?

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So I tried the cannibals carburetor tuning guide for the first time yesterday, and I don't understand at all how it is helpful. You get a blanket slowdown, less control over when you get the speed burst, and I honestly can't tell if there even is a speed burst. Overall it completely nerfed my ability to win chases as i seemed to be going at survivor speed when using the chainsae. Can someone please explain to me why this is a purple perk, how it helps, and how to use it effectively?

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