A viral video on TikTok shows a mechanic saying he turned a car getting 10 miles per gallon into a 40 mpg vehicle using a quick exhaust fix. The video has gotten a lot of attention, but state inspectors and experienced mechanics say there are two big problems. The part does not actually fix anything, and putting it on a street car is completely illegal.
According to Motor1, the video, shared by creator Yuan on TikTok, shows what looks like a simple fix for a clogged catalytic converter. The mechanic says that high fuel use usually comes from a badly clogged cat or a broken O2 sensor. He tells viewers to never use carbon deposit cleaner for the converter and says they should screw a small filter into the part instead.
