On the Japanese Yoshimura website under KTM it shows 6 models non of which is an RC390.
I have no idea what the US website is, it also states: "Made in the USA"?
Perhaps it is a partnership doing different brands and models?
I think the best way to resolve this issue would be for somebody who has the rc390 2015 or 2017 to measure their header length width diameter to see if I can compare it to my 2015 header
If the headers are the same I could order the remaining parts that I do not have in order to mount and attach the exhaust
The closest KTM dealership to me is over 4 hours away and I asked them if they had any of the headers in stock that would go on this bike and they did not they would have to order it and then if it did not work or fit that would be 8 hours of driving for nothing
Please allow me to quote a part of your initial post:
"I am use to having a bike that makes a little bit more noise and I really like the sound of the Yoshimura R77 3QTR. I have a few questions though"
Your endured struggle is nothing but self-inflicted and I bet the majority of bikers actually find this a large enjoyment part of owning and modifying their bike.
It is a constant development 'educating' manufacturers in our bikes as I have found over the past nine years riding Dukes.
Today, again, I have received the following email from Bitubo, Italy:
"Thank you for your email
May I kindly ask you if you can send us the copy of the vehicle booklet? We don’t have your bike in our catalogue and we would like to check the type code"
So there are two approaches to this, either I start a rant on how incapable the International renowned Bitubo suspension factory is or for that matter KTM on this forum, or I provide them with the information for all future small Duke/RC riders to benefit from this effortless email to them.