I have 410 gears Steeda underdrive pullies. My question is I am currently using the performace tune and as i've read on this site i'm not the only one thats unhappy with it. I am using 93 octaine and want to change to the 91 octaine tune will this work well using 93 octaine or should I change to 91 before I reflash to use the 91 octaine tune?