2.5na and 3.5 na exhaust

Hi All, I need to replace the exhaust on my 110. I'm starting to get holes appearing faster than I can weld them up.
I've been offered a stainless double S system veeeery cheap (not best quality I know) but it's for a 2.5 Does any one know if it will fit my 3.5 v8? it's only middle and back box I need to replace but I wasn't sure if the bore diameter was different??

I've just re-used my stainless v8 centre box replacement pipe to make up a system now I've converted to a 300 tdi, the v8 pipe mates perfectly to the 300 downpipe but was larger than the 200 rear I had stashed away.. so not definitive but I would say the v8 must be larger

cheers steve

Yeah I was thinking it might be larger. Hmmm I definitely don't want to restrict the v8 if possible. I think it feels a bit chocked as it is.

iirc the 2.5na is smaller than the bore on a 200tdi.

Ah ok. No worries. I'll skip this then. Might just fit a mild steel system. The boxes are cheap enough if any of them get ripped off then.