It really depends on how much pressure drop you can afford to lose, if you are running 3 bar base fuel pressure and you are running -6AN causing a 15psi drop in pressure, that puts your pump @ 60psi to make 45psi at the rail add 20psi for your boost reference and now we’re limited to what your pumps can flow @ 80psi just to maintain your fuel pressure.
Just because I am a fuel geek, I’ll analyze Travis’ setup.
-6an line @ approx 15ft length
3 x 255LPH walBROSEPHz = 201GPH
E85 specific gravity @ 0.78
= 9.7 FPS velocity = 19ish PSI fuel pressure drop @ rail
LOLZ