ATS Flat Response Knock Sensor kit for Link G4+ or ECUMaster EMU. "Bring your knock sensing into the 21st century!" Ok maybe that's taking it a little far, at least make it better than the 1990's technology you are used to. How about "Bring your knock sensing into THIS Century!" There that's better. If you are still reading this then sorry, I had too much caffiene this morning, and it's made me a little chatty. Ok, so back to the knock sensor kit. What you are purchasing is an OEM Toyota Flat response knock sensor as used on all modern Toyotas, connector, harness, Toyota OEM mounting stud, and nut, basically everything you need to utilize the knock sensing features on the ECUMaster EMU and Link ECUs. If you ask really nicely, and include your order number, you can get configuration tables from sales@atsracing.net to help you get started.