OEM Back Box

[FlynnEK9]

Hey Guys.... Just a Quick Question about an OEM back Box.... I have an aftermarket Exhaust System from the Cat Back... The diameter of the pipe from the cat to the back box is 2.5".... Im just wondering is an OEM back box 2.5" aswell and fit straight onto my pipe.

Thanks

 

[KieranEG6]

no the oem back box is 2" collector size. same for jdm DC2