I'd still bring the link pipes outside of the chassis as you had them before rather than trying to feed one around the diff & inside of the chassis rail. It may mean that the silencers sit a little farther back than you have them positioned in the picture but it will make the links a whole lot easier to manufacture. The Litton chassis is very vertical at the back so leaves very little gap to get pipework through, the engine in a Hawk (system does look like it came from a Hawk) tends to sit slightly farther forward & the rails are angled back at the base so it is possible to bring the link pipes out forward of the rear chassis rails.
If possible make the rear engine bank feed the rear most silencer as this puts about 6" more tube before the silencer (negligible I appreciate) as its a very short system on that bank anyway.
Biggest problem I would say was the size of silencer on the old system & that the silencers were probably not designed to be that close to the manifolds hence they were burnt or blew their wadding out quickly. The new silencers are larger diameter, longer & repackable so you can be more selective in the material you fill them with.
What diameter pipes are on the new system 2" or 2.25"?
Its not quite the same around the manifolds as this is for a 2.5 24v but this is how we do ours.
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