its popular belief that turbo cars dont need big ports & ported heads but its far from the truth the percentage of power that a na engine makes in power with a ported head so will a turbo engine even more so as it as a higher percentage to start with a standard rs turbo with with a good ported head will make 210 bhp with 11 psi boost as stated before on here its one of the best mods you can do to any cvh