I'm experiencing the same great throttle response with the SoCal tunes, truck is a hoot to drive! My 5 Star tunes have great response also, no experience with the others. It will be interesting to see what 1/4 mile times end up when we get the tune the way we want it to satisfy Shawn, esp. with some better air. Which is what I think a lot of the guys at the top of the 1/4 mile times thread had since they've been posted for months now, namely cooler air.