90 300tdi exhaust

Hi, CAn anybody help? I have a Landy 90 1990 it has a 300tdi fitted from a 94 disco. I want to replace down pipe and middle section with straight through pipes. Which ones do I need to make it fit? The rear section will be custom made to fit after down pipe and middle section are fitted so don't need to match up with a standard rear section.
Cheers,
Dave

You be needing a 300 tdi down pipe and front section ?!!

Why are you replacing the downpipe and middle section?? Surely you just need the rear section. If they are buggered, see post 2.

I'm changing them to get rid of power restrictive cat and centre silencer box. Trying to free up a few horses! ;-)