25GTT
Theres a few of these electronic boost controllers on ebay this week i think it would be worth checking out
i just recently bought a blitz ebc, previously i had a bleed valve this is much beta no laaaagggg instant boost i would recomend this my mate has the profec b which is also a great unit it has an extra function that allows the boost to come on instant when the desired psi is meet.
but you will feel the diffrence when you upgrade, well i did.