Velocity stacks just generally simulate a larger runner because your just increasing the volumn of the runner. I have a 500 dollar piece of software and 6 years of experience that will tell me the correct runner lenght. Your going to see major topend advantages over stock with the piece. You can doubt or do whatever. But its not going to change that this is going to be a GREAT product for your tuning community. I will have dyno tests out in a matter of days from some of the fastest all motor zx2 tuners in the us. That will tell the tell. This is just one part of your breathing system. If your cams or headers are not upto the task you could hurt yourself by going to something this aggresive.
Not for the mild at heart definatly
