Corsa 24 Ford MustangGT Xtreme Cat-Back Ex.Sys 3.0in Dual Rear Exit w/4.5in Blk PVD StraightCut Tip
Corsa 24 Ford MustangGT Xtreme Cat-Back Ex.Sys 3.0in Dual Rear Exit w/4.5in Blk PVD StraightCut Tip
CORSA Performance
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PRODUCT DETAILS ▾
The CORSA Xtreme cat-back exhaust (part 21251BLK) fits the 2024+ Ford Mustang GT S650 Fastback (coupe) with the 5.0L Coyote V8 and the non-active (non-valved) factory exhaust. Xtreme is the loudest of CORSA's sound levels for this car (Xtreme, Sport, Touring). CORSA rates it about 16 dB louder than stock, with its No DRONE RSC technology aimed at keeping the cabin drone-free at highway cruise.
Fitment
- Ford Mustang GT S650 Fastback (coupe), 5.0L Coyote V8 (CORSA lists 2024; dealers such as AmericanMuscle list 2024-2026)
- Only for cars without the factory Active Valve exhaust
- Not for the Convertible. CORSA makes separate Convertible systems.
Specifications
- Manufacturer part number: 21251BLK
- Type: 3.0 in. cat-back, dual rear exit
- Material: 304 stainless steel
- Mufflers: custom-tuned, straight-through design
- Tips: 4.5 in. black PVD straight-cut (flat) dual-wall tips
- Sound level: Xtreme, about +16 dB over stock (CORSA)
- Flow: up to 48% more than stock (CORSA)
- Made in Berea, Ohio, USA
- Warranty: CORSA limited lifetime warranty for as long as you own the vehicle, with proof of purchase
Good to know
Bolt-on install at the factory mounting points with no cutting or drilling. CORSA does not list a CARB Executive Order number for this system, so check your state's emissions and noise rules before buying. Fitment is only supported on the vehicles CORSA lists.
FAQ
Will it fit a Mustang GT with the active valve exhaust?
No. Part 21251BLK is built for the non-active (non-valved) GT. CORSA sells separate valved systems for cars with Active Valve exhaust.
Will it drone on the highway?
CORSA uses its No DRONE RSC (Reflective Sound Cancellation) technology to cancel drone at cruise, even though the Xtreme level is about 16 dB louder than stock.
How long does shipping take?
Delivery times vary by part because many items ship directly from the manufacturer or distributor. Message us before ordering and we'll confirm current lead time.
Can I return it?
Yes. Returns are accepted within 30 days of delivery. The customer pays return shipping, and a restocking fee of up to 20% may apply.
WHY WE CARRY THIS ▾
We only list parts we’d run ourselves or recommend to a friend building a real car. If it feels vague, unverified, or inconsistent, it doesn’t make the cut.
- Fitment-first mindset — no “universal” roulette
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WHAT TO EXPECT ▾
This is the clean path: correct fitment, clean install, and results that match the intent.
- Install-ready experience with correct mounting where provided
- Finish that holds up to real driving, not just photos
- Selections on this page drive the exact fitment shipped
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The CORSA Xtreme cat-back exhaust (part 21251BLK) fits the 2024+ Ford Mustang GT S650 Fastback (coupe) with the 5.0L Coyote V8 and the non-active (non-valved) factory exhaust. Xtreme is the loudest of CORSA's sound levels for this car (Xtreme, Sport, Touring). CORSA rates it about 16 dB louder than stock, with its No DRONE RSC technology aimed at keeping the cabin drone-free at highway cruise.
Fitment
- Ford Mustang GT S650 Fastback (coupe), 5.0L Coyote V8 (CORSA lists 2024; dealers such as AmericanMuscle list 2024-2026)
- Only for cars without the factory Active Valve exhaust
- Not for the Convertible. CORSA makes separate Convertible systems.
Specifications
- Manufacturer part number: 21251BLK
- Type: 3.0 in. cat-back, dual rear exit
- Material: 304 stainless steel
- Mufflers: custom-tuned, straight-through design
- Tips: 4.5 in. black PVD straight-cut (flat) dual-wall tips
- Sound level: Xtreme, about +16 dB over stock (CORSA)
- Flow: up to 48% more than stock (CORSA)
- Made in Berea, Ohio, USA
- Warranty: CORSA limited lifetime warranty for as long as you own the vehicle, with proof of purchase
Good to know
Bolt-on install at the factory mounting points with no cutting or drilling. CORSA does not list a CARB Executive Order number for this system, so check your state's emissions and noise rules before buying. Fitment is only supported on the vehicles CORSA lists.
FAQ
Will it fit a Mustang GT with the active valve exhaust?
No. Part 21251BLK is built for the non-active (non-valved) GT. CORSA sells separate valved systems for cars with Active Valve exhaust.
Will it drone on the highway?
CORSA uses its No DRONE RSC (Reflective Sound Cancellation) technology to cancel drone at cruise, even though the Xtreme level is about 16 dB louder than stock.
How long does shipping take?
Delivery times vary by part because many items ship directly from the manufacturer or distributor. Message us before ordering and we'll confirm current lead time.
Can I return it?
Yes. Returns are accepted within 30 days of delivery. The customer pays return shipping, and a restocking fee of up to 20% may apply.
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