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FMF Fatty Gold Series Fatty Pipe is providing a healthy power that increases in all places and expanding the powerband. Fatty pipes are built from 19-gauge steel with a nickel plated finish for maximum durability. They feature Tru-Flo stamping process to deliver optimum performance. Anyone who buys Fatty Pipe can have its great benefits like, having an improved throttle response, a linear powerband, and superior over-rev. These are the reasons why FMF Fatty Pipe is the most popular and number one pipe on the market today. FMF Fatty Gold Series Fatty Pipe is made in the USA.