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depending on whichever you go will give you different power gains.
Catless being the most power gain vs. catted being less of a gain
Downpipes give you more power because they let the exhaust from the motor flow more freely (catless flows more freely than catted hence the power gain).
picture a hose with a kink in it being your stock down pipe…. then remove the kink from the hose thats your aftermarket down pipe…… flows better without the kink right? Thats the dummy way of explaining it lol
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