X Pipes Vs. Y Pipes

Exhaust has to exit a vehicle.

Both X and Y pipes are known as "crossover exhausts," which are designed to increase engine performance by hastening the expulsion of exhaust. Crossover refers to the the exhaust converging at the Y or X center points, depending on the configuration being used.

X Exhaust Pipes

X exhaust pipes are dual exhaust, with two attachments to the exhaust manifold and two exit ports at the rear of the vehicle. The connection of X pipe is known as a Siamese connection, and this design is said to increase horsepower by allowing exhaust to escape from either exhaust pipe.

Y Exhaust Pipes

Y pipes have two sections that connect to the exhaust manifold, but only one exhaust port. The exhaust converges from the dual pipes into the single pipe before exiting. This allows exhaust to leave the manifold more quickly than in standard straight-line systems, increasing horsepower.

X Vs. Y Crossover Exhausts

Both of these systems can decrease the temperature of exiting exhaust and increase horsepower. Racing enthusiasts like the X version better for its ability to provide two exhaust exits, thereby maximizing the increased horsepower and lowered temperature benefits.

References

• Auto Media: Installing Exhaust X-Pipes
• Auto Anything: Bassani Y Pipe
• Pypes Exhaust: X-Pipes
• Car Craft: H-Pipe, X-Pipe, 1, 2, 3...

Resources

• Magnaflow: Universal Tru X, Y & U Pipe Transitions