Available in single- or dual-channel modes What's the difference?

 

Dual means it can support 2WB sensors. Not much use to us 4 cyl Honda/Acura guys, but useful for the V-banked engines where there are 2 O2 sensors in use. I believe OBD2 Honda/Acura does use 2 O2's, but the second is just for emissions feedback to the ECU. Since you're gonna run the EMS there's no point in getting the dual channel setup.

 

Hey I have another question about the AEM EMS and there UEG) WIDeBAND!

Rigth now I'm OBD-1 so my 2nd O2 is just hanging in the car and I have a Test-pipe with Hondata... Does this mean when I go with AEM, I'll turn back to OBD-2 I will have to have a CAT AND PLUG MY 2ND O2 in?

 

The EMS does have a second O2 input, but the second O2 is not needed. Its optional. One Wideband is all you need.