So, been searching over the forums the past few days and getting mixed reviews.

Questions: and my engine is an F20 in reference to these questions.

1.planning on using an 4.1" pulley with my Vortech V2 about what psi should I be at? I've seen posts with 4.00 @12.5psi but nothing really with 4.1"

2.I am shooting for 400whp is it necessary to run upgraded springs and retainers I.e. Dual/Ti ? I don't plan on going past 9k and from what I've read using AP2 intake retainers and AP1 exhaust I should be fine?

3.I know every car is different but was wondering if anyone had a est. of the power I might be looking @ supporting mods are as follows

AEM V1
Vortech V2 (4.1") pulley
Race 110 / pump 92 tunes
ID 1000
Aeromotive 340
T1R 70R with T1R 70 test pipe
3 bar map sensor
Iridium plugs 1 step colder

Thanks in advance

 

Really could use some of the S/C vets to chime in especially question 2

 

No not needed on #2.

 

Why going with a 4.1" pulley. I'd jump right to a 3.8". I'm r&d tuning hopefully Friday with a 3.6" pulley.
I'm currently using a 4" pulley and made 406whp. 4.1 would probably 11 or so psi if guess.