Hmmm, thats weird. 40HP is something you would definitely feel, especially since its a 30% power gain.
Are you sure its an FS-ZE engine? Are you using 91 octane? Did you use the FS-ZE ECU or your stock ECU?
I've been using premium.
I'm using the intake, all the sensors, and ECU that came with the car. I'm sure that's why I'm not seeing much of a power gain.
It's a ZE. It had the intake with the plastic chamber in it, and the intake cam was stamped FSH9, which crosses to the ZE.