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Hi-Flow Catted H-Pipe for 1986-1993 Mustang 5.0L, part number FM7706
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FM7706
FM7706BBK Performance PartsLower

Hi-Flow Catted H-Pipe for 1986-1993 Mustang 5.0L

Hi-flow catted H-pipe for compatible 1986–1993 Ford Mustang 5.0L applications. Designed to connect the engine-side exhaust to the rear exhaust system while using an H-style crossover and high-flow catalytic converters for improved exhaust flow and a classic muscle-car tone.

In stock12 Months

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This H-pipe is appropriate for compatible 1986–1993 Mustang 5.0L applications because it is designed for the Fox Body Mustang exhaust layout, joining the left and right exhaust banks through an H-style crossover.

$620.00$724.71Save $104.71
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003Specification

What it is

SHEET
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SUBJECT
FM7706
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Hi-Flow Catted H-Pipe for 1986–1993 Mustang 5.0L Product Description Shop hi-flow catted H-pipe for 1986–1993 Mustang 5.0L applications when replacing a restrictive or damaged factory mid-pipe. Replacing a used Mustang H-pipe can help correct exhaust leaks, corrosion, and poor flow. Order Ford Mustang 5.0L catted H-pipe for restoration, street performance, or a more responsive exhaust setup. Designed for compatible 1986–1993 Ford Mustang 5.0L V8 models, this mid-pipe uses an H-style crossover with high-flow catalytic converters to connect the front exhaust to the cat-back system. The layout helps balance exhaust pulses while supporting a deeper classic V8 tone and improved flow compared with worn factory components. Key Features Fits compatible 1986–1993 Ford Mustang 5.0L applications H-style crossover design High-flow catalytic converters Helps improve exhaust flow Suitable replacement for rusted or restricted factory mid-pipes Supports a deeper traditional muscle-car exhaust tone Works with compatible factory manifolds or shorty headers Suitable for street-performance and restoration builds Connects front exhaust components to the cat-back system Product Specifications Specification Details Product Type Catted H-Pipe / Exhaust Mid-Pipe Vehicle Ford Mustang Model Years 1986–1993 Engine 5.0L V8 Position Mid-Pipe / Underbody Exhaust Crossover Style H-Pipe Catalytic Converters High-Flow Material Verify Pipe Diameter Verify Front Connection Verify Rear Connection Verify Oxygen Sensor Provisions Verify Emissions Certification Verify Why Upgrade the H-Pipe? A worn or restrictive mid-pipe can limit exhaust flow and create leaks, rattles, or poor fitment. A hi-flow catted H-pipe offers a cleaner replacement path while retaining catalytic converters and preserving the classic H-pipe exhaust character many Fox Body Mustang owners prefer.

Features
  • Fits compatible 1986–1993 Ford Mustang 5.0L applications
  • H-pipe crossover design
  • High-flow catalytic-converter configuration
  • Designed for improved exhaust flow compared with restrictive or worn factory components
  • Helps produce a deeper, traditional muscle-car exhaust tone
  • Suitable for street-performance and restoration builds
  • Connects front exhaust / header area to the cat-back system
  • Useful replacement for damaged, rusted, or restricted mid-pipes
  • Can complement upgraded headers and performance cat-back exhaust systems
  • Designed for V8 5.0L Mustang applications
  • Helps balance exhaust pulses between left and right banks
In the box
  • 1 × Hi-flow H-pipe assembly
  • High-flow catalytic converters integrated into the assembly
  • Left and right exhaust tubing
  • H-style crossover section
  • Front connection flanges
  • Rear exhaust connections
  • Oxygen-sensor provisions where supplied
  • Mounting hardware where supplied
  • Gaskets where supplied
  • Installation instructions where supplied

Shipping weight 50.00 lb

004Application register

Everything this fits

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FITMENT
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Ford1
  • 1979–1993Mustang
    All engines

Intended for compatible 1986–1993 Ford Mustang 5.0L applications. Verify engine size and exhaust configuration before ordering. Confirm compatibility with factory exhaust manifolds or the specific headers installed. Aftermarket long-tube headers may require a different mid-pipe. Shorty-header and factory-manifold compatibility should be verified. Confirm front flange style and spacing. Verify rear connection diameter and cat-back compatibility. Check oxygen-sensor location and thread size. Confirm whether oxygen-sensor extensions are required. Verify ground clearance, especially on lowered vehicles. Modified transmission crossmembers or chassis components may affect clearance. Exhaust hangers should be inspected before installation. Existing exhaust leaks should be repaired. Catalytic-converter emissions legality varies by location. Confirm local emissions regulations before road use. Do not assume CARB or emissions certification unless specifically stated by the manufacturer. Professional installation may be required if exhaust alignment or fabrication is necessary.

005Counter questions

Asked about this part

What is this product?
It is a high-flow catted H-pipe designed for compatible 1986–1993 Ford Mustang 5.0L V8 applications.
What does an H-pipe do?
It connects the left and right exhaust banks with a crossover tube to help balance exhaust pulses and shape the exhaust tone.
What does “catted” mean?
It means the mid-pipe includes catalytic converters.
What does “hi-flow” mean?
It generally refers to catalytic converters and tubing designed to reduce restriction compared with older or more restrictive factory components.
What years does it fit?
It is intended for compatible 1986 through 1993 Ford Mustang models.
What engine does it fit?
It is intended for 5.0L V8 Mustang applications.
Where does the H-pipe install?
It installs under the vehicle between the exhaust manifolds or headers and the cat-back exhaust system.
Does it replace the factory mid-pipe?
Yes, when the vehicle and exhaust configuration are compatible.
Does it include catalytic converters?
Yes, based on the product description.
Can new components smell during initial heat cycles?
Some temporary odor can occur from manufacturing oils or coatings.
Can fingerprints discolor polished metal during heat cycling?
Yes on some finishes.
What is the estimated product weight?
Approximately 30–45 lb depending on pipe diameter, converter construction, flanges, and material.
What shipping weight should I use?
Approximately 50 lb is a practical estimated packaged weight.
Why can shipping weight vary?
Converter design, tubing thickness, hardware, gaskets, and protective packaging affect the final weight.
What should I inspect?
Check the pipes, welds, flanges, catalytic converters, sensor bungs, mounting points, and hardware.
What should I verify before ordering?
Confirm the 1986–1993 Ford Mustang model year, 5.0L V8 engine, factory manifold or header type, shorty versus long-tube configuration, front flange arrangement, pipe diameter, rear cat-back connection, oxygen-sensor locations, transmission and chassis clearance, catalytic-converter emissions certification, local legal requirements, and exact package contents before purchase.
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