Yamaha Performance Exhaust Insert, for YFZ450 and Raptor

All Model Years YFZ450 / Raptor 700 / Raptor 660 / Raptor 350. Replaces factory 5/8 inch spark arrestor with a 1.75 inch performance insert, increase performance / add an aggressive sound. Includes stainless steel working spark arrestor for safety. Replacing the factory spark arrestor insert, these inserts simply slide in place and bolt on using provided fasteners and existing trim ring. No drilling required, simply unbolt and remove stock unit, and bolt on the power. What you get is performance equivalent close to many name brand exhaust slip-ons. And, the sound is awesome, performance without being too loud. Replaces factor arrestor insert in all years of Yamaha YFZ450, Raptor 350, Raptor 660 and Raptor 700. The performance will be the same as a stock Yamaha slip-on with the insert removed, this insert features a refined sound and maintains the safety of a working spark arrestor. 10-15% power increase over stock when used with the recommended jetting and no airbox lid! Noise output tests between 90-94db.