This guy maxed out twin 20g's at 700whp: greddy 20g twin turbo - Nissan 350Z Forum : 350Z / 370Z Tech Forums
Here's another one, looks like the guy make 619whp at almost 20psi: Jay'Z Greddy 20g TT Tuned by UPREV for Big #s!! - Page 9 - Nissan 350Z Forum : 350Z / 370Z Tech Forums
Here's another one, looks like the guy make 619whp at almost 20psi: Jay'Z Greddy 20g TT Tuned by UPREV for Big #s!! - Page 9 - Nissan 350Z Forum : 350Z / 370Z Tech Forums