Ok Iv read a bunch of stuff on this and still have one thing Im not sure on.

If you use say a 3" pully do you have to do the boost bypass mod to see a gian from it?
And what will it take the boost to?

Thanks

 

You dont have to do the BPV mod to get gains you just need to do it to reach full psi potential. I have a 3.15 at sea level and I am pushing 14.5 psi so you should see 15 maybe a bit over. Without the BPV at around 5500 you will drop in boost with it you can go right to 15

 

Thanks So you saying that I will see as gain but at about 5500 RPM my boost will drop off a bit right.

Later

 

YUP thas rite...when the boost bleeds of it feels like the car falls flat on its face

 

Will it drop it below the stock 12.5psi after 5500rpm?

Thanks

 

No, it wont.

 

good question was thinking the same thing im planing on switching my pully up once this snow goes away!

 

Cool. thanks guys.