I apologize if this topic has been hammered into the ground in the past but it is new to me. My understanding of the JD kit is that it provides you with all the jets & needles etc that you need to jett your bike properly but is the performance difference with this kit really worth the money? I Have an 08 KTM 300xc with factory cylinder/piston and FMF/KTM exhaust and have been pretty happy for the most part with the jetting specifications given in the manual. Of course I'd throw down the money if the JD kit provided me with better performance but I just wonder if it is possible to achieve the same performance without spending all the $$$. Any input and experience on the subject would be greatly appreciated. Thanks!!