well my knock sensor broke during all the test fitting installing my intake manifold and I hear you can use the 03 civic si sensor that is much cheaper $40 vs $130. Just want to see if anyone else is using it or should I just get the s2000 sensor.

 

The Knock sensor from a J35 V6 threads in and plugs in. You won't have a P0325. It may even work effectively as a knock sensor, but I don't have a way to measure that.

 

I just found out ballade sports sells one for $80 bucks.

https://www.s2ki.com/s2000/topic/107...k-sensor-assy/