Ok, ask yourself these questions, do you want some kind of button pusher working on your car? If so I presume they send these guys out to work on ANY car, that implies that the button pusher knows exactly what he is doing doing on EVERY car. And they can achieve this working on your drive way with out a dyno? Does this sound too good to be true? How much do you love your Zed, oh and here's the Smurf Cynical question, how do you actually know they change anything if there are no before and after dyno tests that will set benchmarks as reference points? As others have said, it's a pointless exercise without the supporting breathing mods. Please walk away.