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Flowtech Long Tube LS Swap Headers - Natural

1979-2004 Mustang LS Swap; Primary Tube Diameter 1-7/8", Collector Diameter 3"

PART# 12157FLT

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Flowtech Exhaust products are the perfect combination of quality and value. We are proud to offer these 1-7/8" Long Tube Headers for 79-04 Ford Mustangs with LS engines. They are available in natural or polished 304 stainless steel.


  • For GM LS engine swaps into 79-04 Ford Mustangs
  • 1-7/8” mandrel bent primary tubes and 3” collectors with merge spears for increased exhaust velocity
  • 3/8” thick header flanges for strength and maximum sealing surface
  • Available in natural or polished 304 stainless steel
  • Gaskets included


Collector Diameter3.00 inch
Emission Code4
EngineGM LS
Flange Thickness.375"
Header FinishNatural
Header StyleLong Tube
K-Member CompatibilityAJE
Material304 Stainless Steel
Primary Tube Dia.1-7/8 inch
Product TypeHeaders
Tube Material304 Stainless Steel
Type of ComponentHeaders
Part Number12157FLT



This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

Tech Resources

• These headers are for GM LS V8 engine conversion into a 79-04 Mustang engine bay only.

•These headers are not designed to work with a Ford engine

•Headers have been tested using an AJE K-Member and AJE Motor Mount along with a Flaming River Steering Shaft. Any other combination of engine mounts , steering shaft, and k-member, either stock or aftermarket have not been confirmed for fitment at this time.


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