I'm pretty sure that the stock plastic IC pipes can & will easily leak above 10psi. Getting hard pipes will prevent that & should help your boost remain more constant to redline.
I had these pipes and a turbo XS BOV along with the stock BPV and there was no stalling at all.EVER.
these pipes are a very good mod and even if you aren't going to do anything else to your car or your going to mod the s*** out of it you should invest in these.you wont be sorry.
I bought those pipes and also sold them. The only thing I noticed was the turkey was a lot quieter. That's all.
Those pipes are overpriced IMO. After I bought them I regreted it and decided to sell them and save for a FMIC.