Pro Circuit 4" Quiet End Cap Billet 1-1/2" PC4001-0007

If you're running a high-performance dirt bike or off-road vehicle, you know that exhaust noise can be both a liability and a distraction—especially when you need precision throttle control across varying terrain. The Pro Circuit 4" Quiet End Cap gives you genuine noise reduction through proven Quiet Core and Quiet Tips technology, without the performance trade-off that comes with restrictive aftermarket silencers. This billet construction end cap delivers tuned exhaust scavenging for improved power delivery, all while keeping your operation neighborly and your focus sharp.

Built from precision-engineered billet aluminum, this end cap is engineered to withstand the vibration and thermal stress of sustained off-road riding. The modular Quiet Tips inserts allow you to dial in your acoustic signature based on terrain and conditions, giving you flexibility that one-size-fits-all exhausts simply can't match. Installation is straightforward—bolt it onto your existing Pro Circuit exhaust system and begin riding with measurably improved low-end response and refined sound character.

• Billet aluminum construction
• 4" diameter outlet
• 1-1/2" mounting interface
• Quiet Core technology
• Replaceable Quiet Tips inserts
• Enhanced exhaust scavenging
• Bolt-on installation
• Dirt bike/off-road compatible
• MPN: PC4001-0007