What is the benefit of the Tri-Y header design?

The Tri-Y design uses a specific tube routing and collector shape to improve exhaust scavenging. This helps pull exhaust gases out of the cylinders more efficiently, leading to increased horsepower and torque, particularly in the mid-range RPMs.

What material are these headers made from and how does it hold up?

These headers are made from 409 stainless steel, which is a well-built material known for its resistance to heat and corrosion. It's a popular choice for exhaust components that need to withstand the harsh conditions under a vehicle.

Are these headers street legal?

These headers are intended for closed-course competition use only and are not CARB approved. They cannot be shipped to California due to emissions regulations.

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Specifications

Brand: JBA
Part #: 6655S
UPC: 694342531126

JBA 67-70 Ford Mustang 390-428 FE 1-3/4in-2-1/2in Primary Raw 409 Tri Y Header

Name: JBA 67-70 Ford Mustang 390-428 FE 1-3/4in-2-1/2in Primary Raw 409 Tri Y Header
Brand: JBA
SKU: jba-jba-67-70-ford-mustang-390-428-fe-1-3-4in-2-1-2in-primary-raw-409-tri-y-head-t14-447719
Price: 1056.37 USD
Availability: BackOrder

$1056.37

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1967-1970 Ford Mustang. JBA 409 Tri-Y headers for 390-428 FE engines, designed for maximum performance gains.

Key Features

Fits 1967-1970 Ford Mustang.
Designed for 390-428 FE engines.
Constructed from durable 409 stainless steel.
Features large diameter, mandrel-bent primary tubes for improved exhaust flow.
Includes patented JBA Firecone® merged collectors for smooth exhaust scavenging.
3/8-inch thick CNC laser-cut flanges ensure a solid seal.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

JBA is known for exhaust components that help muscle cars breathe easier and make more power. If you're working on a 1967-1970 Ford Mustang with a 390 or 428 FE engine, these JBA Tri-Y headers are built to unlock its potential. They're designed to improve exhaust flow significantly over the stock manifolds, which can lead to a noticeable increase in horsepower and torque, especially at higher RPMs. This is a long tube header design, meaning the primary tubes are longer, which helps scavenge exhaust gases more effectively from the cylinders.

These headers are constructed from 409 stainless steel, a well-built material that offers good resistance to corrosion and heat. The primary tubes are large diameter and mandrel-bent, ensuring smooth bends without any restrictions that could choke exhaust flow. They feature oversized exhaust ports to match the cylinder heads and a thick 3/8-inch flange that's CNC laser-cut for a solid, flat mounting surface against the engine block. The Tri-Y design uses a patented JBA Firecone® collector, which is engineered to merge the exhaust pulses smoothly, further aiding flow and reducing backpressure. This design also aims to provide maximum ground clearance, which is important for keeping the collectors from dragging, especially on lowered vehicles.

This system includes all the necessary hardware for a professional installation, along with detailed instructions. Keep in mind these headers are intended for closed-course competition use only and are not CARB approved, meaning they cannot be shipped to California. If you're looking to get the most out of your FE engine, these headers are a solid option.