Has your spark plug boot ever fallen off during a race? Lord knows that ours has! How about have you ever pulled the spark plug out and seen that the boot has been rattling around on the plug leaving a sooty residue? Ours has! After enough rummaging around in our OEM catalog we have found that the boot off of a KTM 350 fits bang on perfect and is 100% more secure then the cheesy stock 390. This is a beautiful solution to a brutal 390 issue. Get yours today at your local KTM dealer or with us at HIgh Performance Spark Plug Boot