"Is this approved by the Bureau of Automatic Transmission Fluid and Exhaust?" -- ARTICLE: "Fuel filter" ads for silencers.

I've seen these sort of ads on YouTube.

BUYER BEWARE: Facebook Allowing Dubious Ads for 'Car Fuel Filters' - The Truth About Guns  https://www.thetruthaboutguns.com/facebook-allows-dubious-ads-for-fuel-filters/