Curtis Sparks X4 exhaust for TRX 250EX: Stainless steel Full Exhaust System is a great system. The power gain over stock is solid and the power remains very rideable. The exhaust system is very light and durable. The power gain is across the entire range. The aluminum silencer helps reduce weight, looks awesome and makes the little TRX sound like a true four-stroke performance machine. Sound is also well below db restrictions in any riding area. Exhaust tested at 95 db & utilizes stock mounts and hardware.