The ultimate in riding area safety and performance. The ultimate in riding area safety and performance for most KTM Dirt Bikes. Looking to swap that stock can either after crashing, as in our normal daily situation or just to gain some performance and forestry legal protection.? The FMF Q4 has been the industry standard for meeting all strict legal standards for both spark arrestor properties as well as Sound Level Laws and did it with breaking the bank. The FMF Q4 for KTM slide right one to your existing stock headers and allow you to remove one or both of the restricters in the End Cap so you can run it mild to wild. Pick one up here before you get a ticket that will cost you possibly more then this system.