Honestly is 500whp is your goal, I would consider a Haltech or AEM unit. MSNS is nice but it does have its limitations. Its a great unti for us budget minded doing 400 at the wheels. Haltech and AEM ar far superior and with the right tuner will do far more.

The portfueler is a nice setup for someone concerned with emissions and driveability. That setup was designed for the guy runnign down to the Illinois emission center ever 2 years. THe tuner is right about the sampling rates of the Factory PCM and SS box. But that is a compromise dfor a cheapp unit. MSNS is no different.

Sorry......I know it wasnt what you wanted to hear. For what its worth i would run the portfeuler for a couple years and get it up to 400WHP and some tuning under your belt. Use it as a learning tool.

Terry