I know its another silly question from a noob and seems like im .
If i want to get a bigger catback like maybe 3" do i need to upgrade the down pipe or will the 3" fit on the stock part? I heard that the stock pipes where 2.5 that's why im wondering.
I also heard from someone i know it could be nonsense but having 2 different size pipes could take away back pressure and lose HP? ? ? I tried looking it up but im sure it could just be nonsense i over heard.