65 mustang dual exhaust installation

Using the K-code exhaust manifolds required a little change in the H-pipe because the exit of these manifolds is not in the same place as on the standard manifolds. The K-code option used this pipe, which would work just fine on our same body style with a same external engine dimensions.

NPD also offers a complete exhaust kit for our Fastback, as it does for virtually all early Mustangs. The kit included precision bent tubes that are a direct fit along with the correct type of mufflers and factory-style hangers and hardware.

We chose slightly different quad-style exhaust tips shown , which resemble a style offered by the factory. While this system is perfect for moderate performance levels, a larger-diameter system with mandrel bends and less-restrictive mufflers would likely be a better choice for a higher-output engine where noise is less of a concern. This view shows what a typical true dual exhaust system looks like when it is installed on the vehicle. This particular car was a convertible and had the extra underbody bracing for the pipes to clear.

The H-pipe was also a more traditional design than our K-code version, plus the mufflers are aftermarket units, which have a more aggressive tone than our stock replacement-style parts. This system has welded joints instead of using clamps to minimize the potential for exhaust leaks or the parts coming apart.

One trick to consider on cars that have GT-style exhaust trumpets is to have hidden exhaust outlets behind the rear valence panel instead of keeping the OEM trumpets functional. The OEM trumpets look great, but they tend to get dirty from the exhaust very quickly.

Using dummy trumpets to keep that particular look, while having the real exhaust outlets hidden, keeps the trumpets clean and also improves performance. Many different types of headers are available for those who choose that option.

Our choice did require a bit of luck since the K-code engine was no longer offered in Mustangs. Fortunately, it was still available in the similar body style, which allowed us to piece together a system that would work. Classic Mustangs have been getting dual exhaust conversions as long as there have been Mustangs. Exhaust shops have carelessly drilled holes and attached hangers using anemic sheetmetal screws.

With road shock and vibration, screws pull out, pipes and mufflers drop, and it gets quite embarrassing. When dual exhaust systems were factory installed, Ford used stamped steel reinforcement inserts and brackets that provided excellent support. The vintage Mustang reproduction market is never short on ideas for making classic Mustangs a better driving experience.

Available from Classic Tube, the reinforcement plates not only provide the obvious, they also locate dual exhaust hanger bolt holes where they belong for easy installation. These pans lack the reinforcement you need to support Mustang dual exhaust mufflers and tailpipes. Once you have a clean surface, use brake cleaner to dissolve any residue. At the factory, reinforcement pans were spot welded to the trunk pan assembly before the three main subassemblies were joined and bucked.

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