if u want 400whp i say ls/vtec turbo i have a mild built n/a ls/vtec and making 200whp with more room to play and my buddys ls/vtec turbo stock gsr head and stock block and crank but aftermarket rods and pistons on 15 psi on pump gas made 379 with 300 trq and on race gas made 400 at 18 psi as if u went ls turbo u would have to build the fu** out of it. cause it has the the worst flowing head honda makes that is why u do the ls/v setup get the torque of the ls but the power of the vtec motor