Nitrous Oxide - 102mm plate kit feed line?

Have the 102mm plate kit from N20 outlet. Works fine on the 150 shot but is the line they send with the kit -4 big enough for a 250 shot? Do i need to go to a -6 line? Also has the high fuel pressure setup. What fuel pressure is everybody running with a standalone/dedicated?

The 16 ft 4 an main feed will start to hit a wall around the 250 hp mark. So if you want to go over that upgrade to the 6 an and you will be set.

If you have the jets for high pressure set the dedicated at 55psi.
Dave