We did a 35r on a stock 130k mile 7m with a metal headgasket, fuel system, and an Aem standalone and it made 501rwhp@ 21psi, and made 440rwhp on pump gas. The car was daily driven this way for about 30k miles.If you know what you're doing a stcok 7m can hold up to 600rwhp if it's a good motor.