hmm, you should NEVER set any settings with the car on... only on ACCII and then set it ... turn the key off.. the start it to see if it saved it. they say you can mess up the controller if you set it while the car is running. yes you can't really tell in the exhaust too much considering the z6 VTEC is kinda weak.. but you should notice it by the sound you are hearing and if it pulls a little more... NOT a lot more.. but still noticeable. let me know whats up! later

Mason