This cap fits the 17-19 KTM EXC-F and six days bikes. It does not fit Husqvarna. At 19 oz it’s a little heavy but not any worse than your stock cap. It has a 35mm outlet compared to the 25mm stock outlet so power will go up from bottom to top. There is no extra tuning required with this cap.

KTM "EURO" and "AUS" spec exhaust end cap for 17-19 KTM