Peugeot Rear Box how much!?

[C.A.R.]

Xsi has the same diameter exhaust As the '6 throughout, as does the xs I think

I always thought there was a marginal difference, quarter of an inch or something? Hence when upgrading manifolds you have to change mid-pipes (not least because of the downpipe location being very different anyway...)

Who knows the definitive? This is gonna bug me now. Internet cookie to the first person to answer!