[1320WhtRex]

Knock sensor. As to the other questions I don't know.

Yeah but it doesnt connect to the starter.......

30530-PRB-A01 SENSOR, KNOCK

 

[1320WhtRex]

would this work 30530-PPL-A01 im guessing this is the knock sensor from the base model, its like 30 bucks instead of 50 something.....it would work all the same right?

That is the EP3, Civic Si Knock Sensor.... It does work but not sure if the harness is the same...
30530-PPL-A01