how much hp do you think 12psi would make on an rb25? stock its what 250? and an sr is 205, like I said I'm really not trying to do to much more to the motor but a few bolt ons (right now). But I would like to have a nice base for future mods , I love the sr don't get me wrong, mabie I'm just bored and want to do something diff. , something I haven't done before.