Fabspeed Valved Cat-Back Exhaust for BMW M3 F80 / M4 F82 (2014–2020)

This cat-back combines a valved rear muffler with Fabspeed’s Double-X midpipe for the F80 M3 and F82 M4. Original valve actuators attach to the integrated mounts to retain the specified factory control function. Fabspeed Motorsport designs performance exhaust systems, air intakes and ECU tuning in Fort Washington, Pennsylvania. Porsche and other sports-car applications are developed through dyno testing, road evaluation and racetrack work.

Technical Details

• Manufacturer product reference: FS.BMW.F8X.VLVX. The selected option determines the complete supplied configuration.
• 2.75-inch mandrel-bent T304L stainless tubing in 16 gauge.
• Double-X midpipe and rear valved muffler with selected quad outlets.
• Includes OEM gaskets.
• Manufacturer comparison lists 62 lb for the Fabspeed system versus 69 lb factory.
• Published maximum test gains are 19 whp and 31 lb-ft at 3,300 rpm, not the peak-power difference.

Installation Resources

• BMW F8x M3 & M4 Valvetronic Exhaust System (PDF)

Manufacturer Videos

BMW F8x M3 & M4 (2015+) | Fabspeed Valved Exhaust System | Revs and Pulls

BMW F80 M3 / F82 M4 | Fabspeed Valved Exhaust with Single Wall Brushed Quad Tips

Demonstration vehicles may have additional modifications. The selected product configuration determines what is supplied; a video does not establish fitment or guarantee a particular sound or output.

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Fitment & Compatibility