2018-2023 Ford Mustang GT Fastback - 3" Catback Exhaust

The Gen 3 Coyote is the most refined 5.0 Ford ever built. It deserves an exhaust system that matches that energy. Thermal R&D's 3" Catback for the 2018–2023 Mustang GT was engineered to give the Coyote the voice it was always capable of, without the highway drone that turns a great car into a headache.

Most catback systems give you a choice between loud and livable. We don't make that trade. Our proprietary True Helmholtz Technology uses precisely tuned resonance chambers to cancel the droning frequencies that plague highway cruising, while keeping every other frequency raw, deep, and aggressive. The result is a note that commands attention at wide open throttle and disappears into the background when you just want to drive. This isn't a muffler swap. This is engineered sound.

Built from 304 stainless steel and manufactured right here in the USA, this system is designed to last as long as you own the car. That's why we back it with a Lifetime Warranty, no hoops, no runaround. The bolt-on installation requires zero cutting and zero modifications, so you can be up and running in an afternoon. Header adapters are included for builds running aftermarket long tubes.

Finished with 4" quad angle-cut tips in polished or black coated. Four tips. Zero compromise.

⚠️ Fitment Note: This system is designed for 2018–2023 Mustang GT Fastback models without the factory Active Exhaust (active valve) system. If your car came equipped with active exhaust from the factory, this is not the right fit. Not sure if you have active exhaust? Check your order sticker or the Ford ETIS build sheet for your VIN. Does not fit Convertible models.

System Specifications

• True Helmholtz Technology eliminates cabin drone without sacrificing sound
• 3" diameter mandrel-bent tubing for maximum exhaust flow
• 304 stainless steel construction for lifetime durability and corrosion resistance
• Center straight-through muffler design
• 4" quad angle-cut tips, polished or black coated available
• Includes header adapters for performance header builds
• Bolt-on installation, no cutting or modifications required
• Manufactured in the USA
• Lifetime Warranty

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