First, sorry for my loud english

In the goal to build a budget turbo wagon (with a TD04 from a wrx), I'm searching for mesurements to make my own SS equal lenght ramhorn turbo manifold

I have drawn it on solidworks, but with this kind of design
=>

It's almost impossible to get an equal lenght


So i had to extend some sections of my manifold

Here is a view of my work:



I have to precise that I will use standard SS heating pipes and elbows (I have it for free)

So I have approx 410mm long sections for each cylinder (from the head exhaust flange to the start of the 4 in 1)

But how long should the sections be, to be optimal?

Does it is related to the harmonic RPM required??