I bought this when I was going to ride up in the mountains and in idaho you are required to have a spark arrestor. I went the week before I had it and put my stock pipe back on. I had a lot of back pressure with it. Man up and grow in the mountains after I got this spark arrestor for my doctor D pipe and love it. I ride from anywhere from 6008 to 10,000 feet and the performance of my bike never changes. Dr. D products are great I love them.
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Anything I get from Motosprort is alway great