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Hey guys, recently took my car to the tuner after my rebuild. The cars a s14 sr20det 9.0 comp with a t28 on 14psi. He started to tune it but realised it wasnt coming on full boost until 4000rpm and it should be there by 3250-3500rpm. Any ideas what would make it lag this much? He mentioned it may be the vtc gear stuck or the cat being blocked. Seems really odd