evo3 turbo question

[chengsta]

I'm planning to upgrade my stock t25 to an EVO3 BIG16G and was wondering if I should get the 34mm flapper upgrade even though my car will be a daily driver and will most likely not exceed 20psi. I've search all over to find out more about going with the 34mm flapper route but it still got me stumpted since some people say go for it while others say its not needed.

Mods I have my car: '99 spyder gst
-tsudo n1 3inch cat-back exhaust
-hard upper and lower intercooler w/ recirculated monza SSQV
-hard intake
-boost & air/fuel gauge
-apexi SAFC
-megan racing 3in downpipe in the box and ready to install when i get the turbo

I have the rest of the supporting mods coming in.