Ramjet double-stepped long-tube headers and high-flow cats for the Ford Mustang GT
Ramjet double-stepped Mustang GT long-tube header in 304 stainless steel
Ramjet high-flow catalytic converters for V8 performance exhaust systems
Description
The Ramjet Mustang GT Double-Stepped Headers & Cats are equal-length, long-tube headers paired with high-flow catalytic converters for the Ford Mustang GT 5.0L Coyote V8 (2015–2017 and 2018–2023). The stepped primary design (1¾" → 1⅞") maximises exhaust gas velocity and flow for high-horsepower builds without sacrificing low-end torque or drivability, producing a sharp, exotic, race-car exhaust note. Made from premium 304 stainless steel and bolts directly to the factory cat-back.
Specifications at a glance
- Fits: Ford Mustang GT 5.0L Coyote V8 — 2015–2017 & 2018–2023
- System type: Long-tube headers + high-flow cat section
- Header design: Equal-length, double-stepped primaries 1¾" → 1⅞"
- Material: 304 stainless steel
- Cat options: 100-cell metal, or 200-cell ceramic (forced-induction engines only)
- Cat-back compatibility: Standard OEM or 3" aftermarket (select at checkout; connector pipes optional)
- Sound: Sharp, harmonically balanced, exotic V8 tone
- Fitment: Bolts directly to factory cat-back; street-friendly
Why Choose Equal-Length Stepped Headers?
Equal-length, tuned, stepped headers are engineered to extract maximum performance from the Mustang GT’s Coyote V8 by perfectly timing exhaust pulses. Each primary tube is precisely matched in length, allowing exhaust waves to synchronise so every cylinder helps scavenge the next — improving airflow efficiency and cylinder evacuation.
The stepped primary design maintains high exhaust gas velocity at low RPM for stronger torque and sharper throttle response, while opening up flow at higher RPM to support serious horsepower. The result is a broader powerband, faster engine response, and a crisp, harmonically balanced race-car exhaust note that unequal headers simply can’t replicate.
Race-Grade Build, Street-Friendly Versatility
Designed for Mustang GT owners who demand uncompromising performance, Ramjet’s double-stepped long-tube headers build on our proven equal-length design with precision-stepped primaries transitioning from 1¾" to 1⅞", delivering maximum exhaust flow for high-horsepower builds without sacrificing low-end torque. Manufactured from premium 304 stainless steel with race-level precision, they unlock serious horsepower gains while producing a sharper, more exotic exhaust tone. Paired with Ramjet’s high-flow catalytic converters and optional connector pipes, this setup bolts directly to the factory cat-back — race-grade performance with street usability.
Frequently Asked Questions
Will these fit my Mustang GT? Yes — they suit the Ford Mustang GT 5.0L Coyote V8 in both 2015–2017 and 2018–2023. Select your year and cat-back type at checkout.
Do I need connector pipes? It depends on your cat-back. Choose your setup (standard OEM or 3" aftermarket) at checkout and connector-pipe options are presented to match.
Should I choose metal or ceramic cats? 100-cell metal cats suit most naturally aspirated builds. 200-cell ceramic cats are recommended for forced-induction (supercharged/turbo) engines.
Do I need a tune? The headers and cats bolt on as supplied. A tune is recommended to realise the full power gain but is not required for fitment.
Are they road legal? High-flow catalytic converters retain street usability. Emissions rules vary by state, so check your local requirements.
🚚 Shipping calculated at checkout — ships Australia-wide & worldwide
↩️ 7-day returns on unopened items
📞 Not sure if it fits? Call +61 452 071 148 or (03) 9746 6656 — talk to the team who builds these.
Product information
Watch The Ramjet Double Step Hit The Dyno!
PRODUCT FEATURES
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F.A.Q.
They appreciate cut and details, things that aren't so obvious.
What comes in the box?
•2x Double Stepped Headers
• 2x Ramjet High Flow Catalytic Converters
• Cat Gaskets & Bolts Included
Who can install the exhaust?
For the best results, we recommend having the exhaust fitted by a professional exhaust or performance workshop.
Which Mustang models will this fit?
-S550 Mustang GT (2015–2023)
How To Return My Items?
Returns Policy
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, please Contact Us with your order number and details about the product you would like to return. We will respond quickly with instructions for how to return items from your order.
If by negotiation items are accepted to be returned after the 7 day return policy a 20% handling & restocking fee will apply