1965 Mustang X-Pipes


The style of tubing you use when building a new custom exhaust for your car will have a large effect on the attitude of your Mustang when it’s finished. The middle section of your car’s exhaust is crucial for performance and sound, because expansion is still occurring as exhaust gases leave your car’s headers and travel towards the muffler and exhaust tip. If you want to design a system that will deliver peak horsepower and torque at high rpm, the use of an X-pipe, rather than the more common H-pipe design, can be the key to unlocking those last few ponies. This is why this style of tubing is used on racecars. At CJ Pony Parts, we stock multiple 1965 Mustang X-pipes so your street car can use this technology too.

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1965 X-Pipes

Deliver Powerful Gains

What is the difference in the way that an X-pipe and an H-pipe function, you ask? It has to do with the way exhaust gases behave as they exit your engine.

Exhaust gases leave your engine in pulses, rather than in a single solid stream. Because they are not released directly into the atmosphere, but are instead contained by your car’s exhaust system, the motor has to work against the pressure of gasses already in the exhaust system to expel more exhaust. This dynamic is known as “backpressure.”

The 1965 Mustang X-pipes change the way these gasses travel by allowing the pulses from either cylinder bank of your engine to mix, creating a more uniform flow of exhaust gasses that makes it easier for your engine to work at higher rpm when more gasses are being expelled.

An H-pipe, the most common alternative to the X-pipe design, does not affect the travel of exhaust gasses as directly as its X-shaped cousin. The H-pipe design instead allows for a trickle effect, where expanding exhaust gases can move between the left and right sides of the exhaust system, but are not forced to do so. Compared with the way that our 1965 Mustang X-pipes function, this design will result in a grittier sound and stronger performance lower in the rpm range, but will not deliver the power gains at full throttle that we see with an X-pipe.

At CJ Pony Parts, we stock both 2” and 2 ¼” 1965 Mustang X-pipes, so before you buy, make sure that the X-pipes you’ve selected will mate up well with the diameter of the header flange on your car.

Not the year you are looking for? Check out these years: 1966, 1967, 1968, 1969, or 1970 for additional options.