But like others have stated already. Your held to your weakest part. When boost the car, stock 370cc injectors max flow rate is around 18 psi. After that your going to run leaner. But 18 psi is on a 1/4 track running race fuel as well. Come hot days and pump gas, your better off at 15, until you upgrade the Intercoolers. Then daily drive it at 16. Which is still plenty power on upgraded turbo's of those sizes you posted and asked about. Hell I think the 500's Max around 20psi anyway. There just a tad bigger than stock and are cheaper replacements over OEM's. The 600 hang around a 22psi range. So with the 600's and the stock injectors, stock Intercoolers on race gas and 18psi on a dyno should land you in the 420-450rwhp range. Is this for the Black Z for sale or White one to come?