My application: -Rebuilt 4ac with 20k on it with excellent compression across all cylinders. -Timing advanced 3 degrees over stock -Exhaust with 2.25 piping -Fuel regulated at 3psi - AEM wideband After doing countless jet combinations with the 32/36 dgv, it never felt good enough due to the progressive design grandma ease into nature. So I bought this and wow I definitely won't be going back to progressive any time soon. Off the line is so much better, no stumble or sluggish acceleration. Still have to fine tune it as it running mid 11 at wot. -Idling is a lot smoother, and consistent. -cruising is still good no bog or sluggish when on and off pedal. - definitely more responsive which is what I was hoping this would do, since the motor is slow by nature. - I'm expecting to see a decent drop in mpg, but I'm over that if this is the trade off I get. Considering i was getting pretty good gas mileage prior at 24mix and 29 hwy.