http://swedish-acceleration.com/images/picture144.jpg
does anyone know how to do this or if it's a good idea or not? I don't know much about fuel/air mixture and what it does, so just wondering. They say:
"Manual Air/fuel mixture control (which overrides the O2's)...(above)...By doing this you can make the mixture richer or leaner dependant on if you want economy or performance...This gives even more "roar" to our Dual Delta 40 series Flowmaster mufflers."
Is it worth it? will it make that much of a difference?

anyone?

I would like to know more about how that works. The ECU/ECM and the O2's control the A/F ratio. I would leave adjustment of the A/F ratio to a SCT chip.