19j exhaust on 200tdi

Hello, I have a virtualy brand new 19j exhaust on my land rover 90, and i m gonna put a 200tdi in it with a larger intercooler and slightly tuned, posably with a vnt turbo but i am not sure.
I know that a 19j exhaust would fit but, wouldnt it be to restrictive?
and if it would be to restrictive would a straight trhu exhaust help?
Kind regards, Sytse

Yes it will restrict it as it's a smaller bore. 200tdi is 2.5inch.

alright and what can i do to have a better flow without having to make brackets for a 200tdi exhaust?
Its a discovery engine so the conversion downpipe wil also restrict?

I run my 90/200 with it's original 19j exhaust and have found little difference from later models I have driven, perhaps not quite as much top end but not enough to make me change the system.

and does it something to the mpg? and if i remove the midle box wil it be fine?

Don't recon much difference in mpg,and I do not know the effect of going straight through. cheers.