Injector size??

[Carwise]

Hi all, just installed a s1 erl system in to my skyline and I'm trying to work out how many/ what size injectors to use and where to mount them?

Car has a 2.5 straight 6 and will be running upto 20psi.

I was thinking of one jet about 8" from the t/b and one in front of the turbo or after the turbo but before the intercooler.

Any advice would be grate!

Andy