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JBA Performance Exhaust 6655SJS 1 3/4" Header Long Tube Stainless Steel 67-70 Mustang 390/427/428 Cobra Jet Silver Ceramic

JBA Performance Exhaust 6655SJS 1 3/4" Header Long Tube Stainless Steel 67-70 Mustang 390/427/428 Cobra Jet Silver Ceramic

Part Number: 6655SJS

UPC: 694342531140

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Emissions Code

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  • Installation Notes
  • Download Instruction Manual

Installation Notes

Instructions: Instruction Sheet
Estimated Installation Time: 6 hours
Installation Footnotes
29 - Matching mid-pipes available.
3 - Installation requires welding/modification to exhaust system.
41 - Fits most rack and pinion conversions.
42 - Fits with power steering when 6656P JBA power steering ram drop down bracket is used.
Know your EO

JBA Performance Exhaust uses a voluntary product identification program whereby all emission sensitive products can be identified by placing numbered labels in product packaging and listing corresponding numeric codes next to each part number. The corresponding numbers and explanations are as follows:

EO Placard 2

This product is Legal for use on 1974 and older non catalyst equipped vehicles and is considered a Replacement Part per California Air Resources Board regulations, as long as ALL emissions sensitive components are retained, including A.I.R., EGR, Heat Risers etc. Failure to retain any of these components, or use on any 1975 or newer catalytic converter equipped car would render this product Illegal for Street or Off Highway use in California, or in states that have adopted California Emissions regulations and may only be used for Closed Course Competition.

Additional Information

JBA long tube headers are the number one choice for maximum performance gains and high RPM efficiency. These long tube designs are dyno and race proven to deliver the greatest possible increase in horsepower and torque throughout the RPM range. All JBA long tube headers feature large mandrel-bent stainless steel primary tubes, oversized exhaust ports, extra thick 3/8" one piece flanges, and patented JBA Firecone®* merged collectors for smooth flow. Each system is designed to give the maximum amount of ground clearance possible so lowered cars do not drag the collectors. Each system includes high quality hardware and thorough instructions for a professional no-leak installation. *Standard on 4-1 long tube V8 applications. Not available on Tri-Y headers. 1. 3/8" thick CNC laser-cut flanges • Prevents leaks caused by warping 2. Patented JBA Firecone® merged collector • Increased hp/tq, improved exhaust scavenging 3. O2 sensor provisions • Standard on EFI headers for proper connection 4. Large dia. mandrel-bent stainless steel primary tubes • Maximum flow and high RPM efficiency 5. Oversized exhaust ports • Accommodates ported cylinder heads


Application Notes
w/ C6/4 spd trans.
67-70 Ford Mustang 390
67-70 Ford Mustang 427
67-70 Ford Mustang 428
67-70 Ford Mustang CJ

Download Instruction Manual

Instruction Manual
Instruction Manual

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