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The S550 Mustang GT is an icon of American muscle—but when fitted with aftermarket headers, the sound can become harsh, raspy, and unruly. Valvetronic Designs has created the definitive solution: a valved exhaust system engineered to deliver a smooth, refined, yet aggressive tone worthy of the Coyote V8.
By integrating a center resonator, our system tames unwanted rasp while preserving the deep, muscular character Mustang owners crave. Whether paired with factory manifolds or adapted to aftermarket headers, this is the exhaust that finally gets the S550’s soundtrack just right.
Valves Closed: A composed, neighbor-friendly tone with minimal cabin intrusion—perfect for early mornings or long highway drives.
Valves Open: A commanding, throaty roar with a refined top-end, free of excessive rasp and harshness.
Center Resonator Integration: Smooths exhaust tone and reduces harsh high-frequency rasp.
Vacuum Actuated Valves: Precision control over sound levels and longevity-focused operation.
Weight Reduction: 11.3 lbs lighter than the OEM system for improved handling.
Material: Premium T304 stainless steel for corrosion resistance and durability.
Finish: Dual-wall black tips for a bold, aggressive appearance.
Build Quality: Fully mandrel-bent piping and precision TIG welds for strength and maximum flow.
Reversible Installation: 100% bolt-on design allows you to return to stock at any time.
2015–2023 Ford Mustang GT (S550)
Does not fit convertible models.
Design: Valved cat-back with center resonator
Material: T304 stainless steel or Grade 5 titanium
Tips: Dual-wall black tips
Weight Savings: 11.3 lbs lighter than OEM
Questions or build guidance? customerservice@valvetronic.com
Refined muscle, unleashed. The perfect sound for your S550 Mustang.
Questions?
Small items arrive to you in under 1 week
Larger products like full suspension kits must ship freight and can take 1-3 Weeks
Instructions are included for most parts that require any sort of knowledge to install.
Here's what to do if your parts come WITHOUT instructions:
1. Some parts are genuinely common sense on how they get installed
2. If you can't figure it out on your own, YOUTUBE IS YOUR FRIEND! Our founder started this company from learning how to build headlights off a YouTube Video
3. If there are no videos on YouTube, or instructions anywhere on Google then please CALL OR EMAIL US and we will guide you through or get you instructions from the manufacturer
4. Doing installs on your own is always fun, but sometimes, it isn't. Always consider having your parts professionally installed
ALWAYS CONSIDER US. We sold you the parts, let us install them at THE LAB in Connecticut. We offer enclosed and open cross country transportation.
Of course you won't want to spend thousands on transportation to install lug nuts or emblems but if you are spending a LOT of money on parts, you may just want to send the car our way
If the part was NOT installed, we accept returns within 14 days of delivery.
If the part WAS installed (or attempted installation), we cannot accept a return.
All parts come with Manufacturer Warranty! Each manufacturer has different warranties so we suggest reading up on their warranty policy before ordering.
YES! If you come across a competitor with a lower advertised price than us, we will BEAT it by at LEAST 1%. Please contact us with proof of the lower priced product.
NO! We do not give out discounts or do sponsorships. You can get 5% OFF your first order by signing up for text & email notifications. OR just wait until our BLACK FRIDAY Sale that happens once a year.
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Phone: (475) 227-5381
Email: sales@legendsautoparts.com
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