vtec is really just a race cam that kicks in at 5500 rpm. any bigger cam is going to help a turbo out. bigger cams make more power. all the turbo does is cram more air/fuel into the motor. granted i wouldnt put huge all motor cams in my turbo set up bc it wont run rite, but stock vtec cams would help the turbo out. keep in mind u wont b able to run as much boost bc of the higher compression, but that doesnt necessarily mean ull make less power.