Corsa 21259BLK Xtreme Cat-Back System for 24-27 Mustang GT 5.0L w/Active Exhaust

Vehicle Fitment

• 2024-2027 Ford Mustang GT (S650, 5.0L V8 Coyote, Fastback/Coupe only)

Fitment Notes

• Fastback (coupe) only -- convertible uses separate part numbers (21270/21274)
• Requires factory Active Valve Exhaust -- must use OEM Active Exhaust module for install
• Not compatible with Mustang Dark Horse -- see separate Dark Horse part numbers
• Alternate tip finish: polished slash-cut (21259), carbon fiber (21259CF)
• Direct bolt-on -- no cutting or welding required

Features

• Corsa Xtreme sound level -- switchable to Touring via factory Active Exhaust
• +16 dB louder than stock at Xtreme setting
• Double HELIXX twin crossover x-pipe
• Corsa RSC (Reflective Sound Cancellation) -- no drone technology
• Active valve integration -- preserves factory drive mode sound control
• 3 in. mandrel-bent T304 stainless steel piping
• 4.5 in. Pro-Series Black PVD dual-wall slash-cut tips
• Dual rear exit
• Lightweight design -- weight savings vs. stock
• No cutting or welding required
• Engineered and made in USA
• Lifetime exhaust warranty / 5-year valve warranty

Specifications

• Part Number: 21259BLK
• Series: Xtreme Active
• Type: Cat-Back
• Pipe Diameter: 3 in.
• Material: T304 Stainless Steel
• X-Pipe: Double HELIXX twin crossover
• Exit: Dual Rear
• Tip Size: 4.5 in.
• Tip Style: Pro-Series dual-wall slash-cut
• Tip Finish: Black PVD
• Sound Level: Xtreme (+16 dB) / Touring Active (switchable)
• Active Valve: Yes -- integrates with factory OEM module
• Country of Origin: USA
• Warranty: Lifetime (exhaust) / 5-Year (valves)

Included Components

• Cat-back exhaust system (all pipes and sections)
• Double HELIXX twin crossover x-pipe
• 2x 4.5 in. Pro-Series Black PVD slash-cut tips
• All clamps, hardware, and installation hardware

Product Description

The Corsa 21259BLK is an Xtreme Active cat-back exhaust for the 2024-2026 Ford Mustang GT S650 Fastback -- engineered specifically for Mustangs equipped with the factory Active Valve Exhaust system. Corsa's Double HELIXX twin crossover x-pipe maximizes exhaust scavenging and flow from the 5.0L Coyote V8, while the Xtreme-tuned valved mufflers deliver a +16 dB increase over stock at full open. The Active Valve integration preserves the OEM exhaust drive modes -- Quiet Start, Normal, Sport, and Track -- while dramatically improving the sound quality and volume at each setting. Corsa's RSC (Reflective Sound Cancellation) technology eliminates drone frequencies, ensuring a quiet, comfortable cabin at cruise despite the aggressive note under acceleration.

The system is constructed from 3-inch mandrel-bent T304 stainless steel throughout and exits through 4.5-inch Pro-Series Black PVD dual-wall slash-cut tips. Installation is a direct bolt-on -- no cutting or welding required. Fastback models only; convertible requires a separate Corsa part number. Factory Active Exhaust module must be present for proper installation and valve operation. Engineered and manufactured in Berea, Ohio. Backed by Corsa's lifetime exhaust warranty and a 5-year valve warranty.