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This Y pipe connects to crossover headers. Only one muffler is used in this system. This system works very well on tracks 51/48 mile and shorter. The Y system itself somewhat muffles the engine noise by its blending. Use 3-inch diameter pipe for engines under the low to mid-500hp range. For engines exceeding the aforementioned horsepower range, the use of 311/42-inch pipe will show a power benefit. Be realistic in estimating your horsepower.