S2Kitt

I'm planning on purchasing an PNP Boomslang Harness for my E-manage Ultimate an the site requires you to pick 1 of 4 different inputs: (air&water), (Knock&water), (Knock&air), (Dual Knock).

My question is which one do i need?

I'm N/A an plan on staying N/A
I have a few bolt-ons an I'm aware that there will be no significant gains in HP, just want the car to run at its potential, it was really lean at the bottom an then got rich at the top when dyno'd last.

any help would be great, just dont wana spend $200 on the wrong one.

Thanks