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Current setup is a 56mm hx35 over a 70mm Garrett , wastegate opening at between 20-25 psi I'm only getting 50psi at full throttle it pulls hard but I expected more boost out of this setup , 66mm single felt as if it pulled harder . Any ideas? Wastegate opening too soon?

Ok so I've ran into a lack of space with this compound setup, it's a 60mm hx35/40 over 74mm I don't have room to incorporate the hx35s built in wastegate, do I have any options other than buying a manifold with mounting flange and an external gate? Also will it hurt anything to run the truck...