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They work like an after-burner without the noise, flame or positive effect. Every TD42 should have one fitted as they stop global warming and increase the density of of plankton in the oceans so the whales can get big and fat and rise to eat the japanese hunters.
However most people fit them incorrectly. If you put them on backwards or inside out, not only they have the all the the pre mentioned advantages, but also they reduce climate change, print money, make people more attractive and cures leprosy.
Might help maintain exhaust gas velocity if it were placed immediately after the catalytic converter.
Pretty sure that photo is a pisstake or someone just has a sense of humor :)
https://youtu.be/A9vLNbFMPr4
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