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Not sure what pulley size to get

3.4 pulley here same setup as you, gen v stock heads, n*, headers, Catback, 103, intake, ported lim, 60 injectors, and this is on 91oct. If you have 93, I would just add more timin to it. Personally.
 


I believe it is around 8-10 psi of boost 10 being the max the car is sitting due to my tranny going out so I literally drove it for about 2 weeks once the tune got done. Personally if I were you buy a 3.4 and a 3.3 and a 3.5 to be able to switch them out and see which works best, because at the end it isn't the size of the pulley but other factors that make a bigger difference like timing.
 




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