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"x" pipe exhaust cross over

Performance Modifications

Vehicle Information: Year: 1986; Engine (size, modifications): 5.0 liter; Total Mileage: 115,000; Transmission type: Manual;

What are your thoughts on the "X pipe" cross over exhaust mods? I understand they are more efficient than stock systems and a good way increase horse power in the 85-86 928s

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