oh and here are the pics of the header when it just arrive.

https://www.s2ki.com/forums/index.php?showtopic=346946

 

J's for me~

Jay

 

Check also My J's Racing S2000 Project

I have done a review there.

 

The stock 02 sensor is what is called a "narrow-band" sensor. It is basically capable of telling the stock ECU one of 3 things... rich, lean, and "just right" (aka stoichiometric). If you are not going to modify your car this sensor is MORE than adequate.

BUT when people have the capability to tune their cars (with a VAFC or an AEM EMS for example) they can not rely on the stock 02 sensor... so they use a "wide-band" sensor that will tell them precisely how rich or how lean the engine actually is. If you look on most dyno plots you will see two different graphs... one is hp/torque, the other is the air/fuel ratio. A wideband 02 sensor is mandatory for the air/fuel ratio plot on a dyno.

So when headers have 2 bungs... it doesn't mean that you have to use both. Most people only use 1. But the option is there for you to have one sensor used for the ECU, and one sensor used to monitor.

 

thanks.. great explanation.

 

wayne, here's a link to my dyno #s with the J's header.

https://www.s2ki.com/forums/index.php?showtopic=348987

 

The J's header is what is gonig on my car

 

I'm going with the Amuse header for the sole reason that I believe its the best match for my Amuse R1 Titan exhaust, otherwise if I had any other exhaust, I would go with J's.