dyno graph think it shows 12.5
i have a 3inch front and dump pipe combo for this with screamer
have most the oil and waterlines to fit u just have to alter urs slightly wich i can explain in more detail
i have a manifold modified to suit the turbo i can provide also
can get picks if necersary as it came off the car on the weekend
it has been bolted onto an rb20 for the past 1000kms
and i hit 16 pound by 4500rpm and all i got is a 500hp fuel pump a fmic
and a full 3inch exaust
id say on an rb25 it would hit full boost by just before 4000rmp maybe earlier