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You have misunderstood where the X pipe goes. Here's the layout from engine to rear of vehicle: 1. Exhaust manifolds or headers. 2. Dual 2 1/2" exhaust pipes. 3. The X pipe is next and within 3 to 4 feet of the rear of the engine!! 4. Again Dual 2 1/2" pipes into 2 1/2" inlet mufflers(2). 5. 2 1/2" outlets from mufflers to same size dual exhaust pipes to exit the vehicle where you choose. The X pipe should be BEFORE the mufflers and where the system gets hot enough to cook spray paint off of the exhaust pipes.
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