It was perfect for fitting my new 6637 filter to my F250 7.3. A whistle of this size was very difficult to find locally so finding one at Revain was great. It came the right size for what I needed. It's about 4 inches long so I didn't have to cut it or anything. Just install. The finish is also very nice. It has a nice polished sheen and looks great under my hood.
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