the 2.2 Ecotec is a DOHC motor
Unlike the normal OHV 2.2/2200
as for Power adders GM has a S/C for the ecotec my buddy has it in his sunfire hes now running 13.8. or you can take the entire Turbo Setup off a Saab 9-3 and it bolts right up
the ecotec can handle around 10-12psi on the stock internals