[M1one1M]

Does anyone know what the OEM exhaust diameter is?
Similarly what diameter are the aftermarket systems (eisenmann and akra in particular)

And can someone please clear up once and for all whether the Eisenmann's mid section has cats or not?

I am aware that you can choose between the eisenmann resonator or straight pipe when you purchase the system, just wasn't sure whether it has cats too or whether their complete system is cat free (downpipes back)

Thanks in advance, apologies for all the questions.