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No, not for 450+ HP. The EZ and RV275s will add about 100 HP tops, putting you under 350 HP total. Twins only help you to burn more fuel - they don't add any power. With RV275s and an EZ you already have plenty of air.
To get to your goal you may want to look at an Edge Comp + bigger injectors.
DD3's, a drag comp and twins should get you real close. Depending on what you want to do with the power you could also go for way bigger injectors (like stage 4-5's) twins and a smarty.
just from my experience - I have a Drag Comp and stage 5 injectors and with my stock turbo I dyno'd at 417hp 889rwtq and with twin turbo's same setup I dyno'd at 484HP and 1017RWTQ