for a b18b stock internals running 5-8lbs what would use? AFC hack or vortech FMU for fuel management.

Khoi

 

I would go with the AFC and DSM 450's.

This will give you way more tunability, plus if you want to up the boost, you can do it fairly safely.

8-10psi with the AFC..................go for it!

Just say no to the FMU high pressure set up!