Put this on my machine in about two minutes. It definitely dropped the sound volume a noticeable amount without any loss in power, and it still sounds good. I am not a pro or amateur racer so the power change might be noticeable to others. For my purposes this was exactly what I needed to quiet the ATV yet keep my performance high. It was simple to install and if I want to remove it that will be easy too. Definitely recommended.
Pro Circuit Quiet Insert With Spark Arrestor
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I bought a used CRF230L and the previous owner had removed the baffle. It was soooo loud and annoying. The OEM replacement was around $100. I bought this piece and it's working out. There were two challenges on the installation. 1) I had to file the opening to the exhaust about 1/32" to get the spark arrestor to fit. 2) the three pre-drilled holes were not aligned with the mount points on the exhaust. I used a round hand file to remove about 1/8" of material from the holes. After that, I used #6 bolts to mount the unit to the stock exhaust.
I bought this part not certain that it would fit my TTR125. There were apparently older models, pre-2006, with different exhaust diameters. When the part arrived, it bolted right on, no problems whatsoever. Now my bike is much quieter and the spark arrester allows it to be ridden on public trails. Without this insert, my bike was quite loud and I was hesitant to ride it at my friend's track or on the road (bike has a light kit and is street legal) and attract unwanted attention.
This spark arrestor is ok if you like endless hours of work! I had to cut and grind things down just to get it to fit!