Jac Mac
your pairing is the one which can be seen perfectly on the FFR daytona coupe exhaust system.
But on the other side EGLI spend a lot of time developing a 4 into 2 into 1 system for 4 cylinder bike which improve significantly mid rpm torque by keeping top rpm power
Look at this : Does confirm my experience on my racebike.
exhaust
they call the configuration i´m talking about a 360 Try-y possibly because of the 360° crank spread between the paired cylinders.
For a V8 this would mean two pair ( if i have the crank order correct ? ):
1 -- 6
merge collector --- Muffler /megaphone
4 -- 7
2 -- 8
merge collector --- Muffler/megaphone
3 -- 5
Experience shows that the headerlength till the first pairing is app .15 - 20 inch, and there is the point where theory parts with reality on a V 8 . As you would always have to pair with the other cylinderbank side it is just not possible to built this system and stay within the correct lengths. ( besides running your engine without an intake system boomsmile)
If one would built 180° Try-y the pairing would be :
1 -- 4
merge collector --- muffler/megaphone
6 -- 7
5 -- 8
merge collector -- muffler/megaphone
3 -- 2
if i´m not wrong there are always at least 180° between the different firings ( between some 270 ). From what i see on the pictures this system could also be built in GT 40 with the correct pipe lenght ( may be tight in the area of the rear radius suspension rods)
But somehow i have the feeling im missing some iimportant point ( why than would be your reco and the daytona exhaust different).
PLease help
TOM