I received my blue injectors from Marren. The box was opened 5 minutes ago and I'm still comparing them. 072's are blacks and 304's are blues. Blacks are 14.8 ohms and blues are 15 ohms. Static flow / blacks 410 cc at 43.5 psi and blues 460 cc at 43 psi. Check out the flow volume and don't ask why the blacks were flowed at 43.5 and the blues at 43 psi. I don't have an answer. Comments?

Les