Have s4 and need to now if i can convert the 6 port acuators to a s5 electrical actuation so that when I put an exhaust on i can ditch the cats. That way don't need to tap a hole for split air tube into exhaust. Im think id get more horsepower taht way due to the fact that there is no back pressure needed.

 

Ive done the conversion PM me for more info.
BTW backpressure is use for high end power only, w/o the ports work YOU WILL lose all high power. In otherwords it will be a dog above 3800 rpms
chris