I've a 2015 SGS with stage 1 and PV tune that I'm looking to upgrade to the Target Tune while also adding S&S headers to the SPO mufflers already installed. The TT kit appears to be supplied with 18mm sensors while my headers have 12mm entries in the stock position, near the gearbox, and 18mm by the exhaust ports (the most efficient location?). Is there an extension lead available that would allow me to use the 18mm ports or are users opening up the 12mm ports?

 

TT has long enough leads to reach the 18mm ports. They don't plug straight into the leads on the bike. They go to the controller then the leads to the ECM. I believe there is a youtube video on install.

 

I believe ther are versions with different length leads. This is the version fuel motor sent me. I will be using the ss power tune headers, with the dual o2bungs. (18mm near the cylinder). The cable that goes from the o2 sensor to the target tune module measured about 52" long. Depending on your bike/exhaust, that should be plenty of length. For mine, I will run the lead for the front cylinder under the fuel tank. The rear one not sure, but whatever route hides things the best.