Item # 70217 - This exhaust stack kit comes in your choice of four different diameters (5" 6" 7" & 8") with seven different main pipes and one pair of crossover pipes. The main pipes are 8 inches long and can be cut to fit your desired length. The crossover pipes have a combined measurement of 7 1/2 inches long. All measurements are +/- 0.50 mm approximately.