Yea, seeing that the injectors and the turbo's ( both stock ) seem to be around 18psi to 19psi Max, they seem to run parallel on the Max performance. But like chip said, 555 when it's time to replace ( make sense ). Is not the single Pop charger good for 450rwhp, which is also like you stated, passed capabilities of stock T25's and something upgraded beyond them. I've seen some'd Dyno's and statement about dual pops loosing TQ or low end power.