Used Akrapovic slip on silencer. Works with stock or aftermarket header. Used for 25 hrs. Has some minor surface scratches but no dents. I do not have a spark arrestor insert. But there is a screen halfway through the muffler like the oem mufflers have. Fits 2019-2022 KTM Husqvarna and 21-23 Gasgas 250 350 and 450. Motocross and XC bikes. I’m not sure about the enduro bikes. Part number 795.05.979.000