A Scorpion with a 3" bore, are you sure? If it is that is costing you power at your power level.

Is a Kent 25 even for a turbo CVH?



Basically your spec is good but you are lacking a decent intercooler. That is the biggest thing stopping you from upping the boost. Fit something like a GRS and you could run around 20psi. Shame it is standard compression otherwise you could go a bit further.