Steeda Shelby 304 Stainless Resonator Delete | Mustang
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Part #555-3621

2015-2023 Ford Mustang GT350 – Steeda Shelby 304 Stainless Resonator Delete H-Pipe

Fits These Vehicles 2015-2023 Ford Mustang GT350
Price Original price was: $330.00.Current price is: $304.95.
  • Engineered and manufactured in Valdosta, Georgia
  • CNC-machined billet construction where applicable
  • Tested on Steeda's SCCA Majors race program
  • Steeda authorized dealer — exact MAP pricing

Limited Lifetime Warranty

Backed by Steeda — FFP is an authorized Steeda dealer and warranty claims are honored direct.

— Function Factory Performance

Authorized Steeda Autosports dealer. MAP pricing — the same price as steeda.com. Expert install available at our Thousand Oaks, CA shop. Questions on fitment or setup? Chat with Senna or call our specialists.

Overview

The full breakdown.

Install
Easy
Time
1.5 Hours
Warranty
Limited Lifetime

Overview

Steeda’s GT350 H-pipe is the perfect way to bring a unique and more classic muscle car tone to your 5.2L flat-plane crank engine. You can expect a deeper rumble at idle and a growling acceleration when you upgrade to this resonator delete.

More low-end power. H-pipes are known for delivering more low-end power and torque, while x-pipes deliver high-rpm performance. This upgrade is a great way to give your Shelby’s low-end power a nudge.

Unique sound. If you are looking to make your GT350 stand out with a one-of-a-kind sound, this is the way to do it. The H-pipe delivers a growling and tough sound while both the stock and aftermarket x-pipes have a nasally and raspy note.

Product Gallery

Key Benefits

Proudly made in the USA!
Improves low-end torque over factory resonator
Deep traditional muscle car like exhaust note
Premium T304 stainless steel will not corrode or rust
No tune required
30.75″ overall length
Band clamps allow cut to shorter length
Can easily return to stock
Gain of up to +6hp and 4 lb/ft of torque.

Specifications

Installation Difficulty
Easy
Estimated Install Time
(approx.) 1.5 Hours
Tools Required
3/8″ Ratchet, 14mm Socket, 15mm Socket, 14mm Wrench, 15mm Wrench, Reciprocating saw, Angle Grinder, Jack, Jack stands, Safety glasses, Gloves

Video

📄Download Install Instructions (PDF) — Steeda’s official guide

Fitment

2015-2023 Ford Mustang GT350.

Why Steeda
The leader in Ford performance.

Steeda has been engineering and manufacturing Ford performance parts in-house in Valdosta, Georgia for over 35 years — proven on their own SCCA Majors race team and trusted by enthusiasts who live and breathe Ford. CNC-machined billet construction, proprietary CAD-driven suspension geometry, and a relentless focus on the platforms they specialize in.

QS-9000 & ISO 9001 manufacturing · Limited lifetime warranty on Steeda-manufactured parts · Made in the USA

First-hand note

FFP fits Steeda parts every week in Thousand Oaks.

— Why we stock Steeda

OE-style engineering, in-house manufacturing, race-proven on Steeda's own SCCA program.

Steeda has been engineering Mustang — and now Explorer, Focus, F-150, and Maverick — parts in Valdosta, Georgia since 1988. CNC-machined billet, proprietary CAD-driven suspension geometry, and a factory SCCA Majors road-racing team that runs their own parts on the track every weekend. When you bolt a Steeda part onto your car, it's the same part Steeda's own race cars run.

We carry Steeda because the fitment is right the first time, the warranty is real (lifetime on Steeda-manufactured parts), and the install instructions don't leave you guessing. Drop the car at our Thousand Oaks shop and our techs handle the fit-up — or order with confidence and run it yourself.

Authority: Charles Siritho · McLaren Artura Trophy owner · Spotter for Branden Sorensen FD Pro (E46 LS+Whipple, 6th at Long Beach R1 2026) · 10+ yrs Mustang & Corvette specialist

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— FFP is an Authorized Steeda Dealer

Shop the full Steeda catalog at FFP.

The leader in Ford performance — suspension, intakes, exhaust, brakes, wheels, and more — for Mustang, Bronco, Bronco Sport, Explorer, F-150, and Maverick. Enthusiast-driven, race-tested. MAP pricing always. Expert installation in Thousand Oaks, CA.

BROWSE ALL STEEDA →
Price Original price was: $330.00.Current price is: $304.95.
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OVER 35 YEARS IN FORD PERFORMANCE. RACING EVEN LONGER.
— Steeda Autosports · sold & installed by FFP
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