Free shipping on orders over $100 - Details

Flowtech Long Tube LS Swap Headers - Polished

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

Part # 12158FLT Be the first to write a review
In Stock
Free Shipping
Your Price
Suggested Retail
Add to Wish List
Create a new list
Starting at $30 a month with Learn More
Flowtech Exhaust products are the perfect combination of quality and value. We are proud to offer these 1-7/8" Long Tube Headers for 1979-2004 Ford Mustangs with LS engines. They are available in natural or polished 304 stainless steel.


  • For GM LS engine swaps into 1979-2004 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

About Flowtech

Performance and value intersect at Flowtech. From full-length stainless steel headers for your 1969 Camaro to turbo-back exhaust systems for your late model diesel truck, Flowtech delivers the sound and power you're looking for while being easy on your wallet.

Bolt SizeM8 x 1.25 x 25mm
Brand Flowtech
CARB (California) CompliantNo
Collector Diameter3.00 inch
Emission Code4
EngineGM Small Block Gen III/IV (LS Based)
Header FinishPolished
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 Number12158FLT

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

• These headers are for GM LS V8 engine conversion into a 1979-2004 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.

    Your Review

    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.