[MNE54]

have an opportunity to get a cheap M135 twin exit back box and was wondering if it would fit my F20 118i. Would it improve the exhaust note enough ?

Am I better getting a custom made backbox delete/twin pipe setup e.g. Powerflow ( would be about twice the cost )

I guess it would need a sleeve or join of some kind but I was mainly wondering if the space underneath the boot was same> I will be getting a twin pipe rear diffuser also

thanks !