2014-2020 BMW F80,F82 M3,M4 3.0L Catback T304 Stainless Steel Burnt 3.5 Inch Outlet Tips by Valvetronic Designs

The S55 engine powering the BMW F8X M3 and M4 is a performance masterpiece, but its stock exhaust note has long been criticized for excessive rasp and a lack of tonal depth. The Valvetronic Designs Equal-Length Valved Cat-Back is the definitive solution-eliminating the factory harshness and unlocking the rich, balanced sound the S55 was always capable of producing.

This system features a 2.75-inch equal-length mid-section with an H-pipe feeding into a 3.5-inch axle-back. The equal-length design smooths the exhaust tone across the rev range while preserving the aggressive character owners love. With valves open, gases exit freely from the passenger-side tips for maximum volume and performance.

With valves closed, flow is routed through our quad-chamber muffler to the driver-side tips for a quieter, more refined note-ideal for daily driving. No cutting or welding is required-this is a true direct bolt-on system designed to mount to factory points.

Details:

• Brushed T304 stainless steel
• 2.75-inch equal-length mid-section with an H-pipe feeding into a 3.5-inch axle-back
• Electronic Valve Control: Includes standalone controller; OEM integration available.
• 21.7lbs lighter than the OEM system
• Paired With Valvetronic Designs Burnt Single Wall Tips

What's Included

• 2.75 Inch equal-length H-pipe mid-section
• 3.5 Inch axle-back with quad-chamber muffler
• Electronic valve system with controller (OEM integration optional)
• Valvetronic single wall burnt tips

Installation Notes

• Direct Bolt on installation; no cutting or welding required
• Note for S55 Owners: On free-flow/race downpipes, 2k rpm rasp may be present during low-rpm shifts
• For the most refined tone, we recommend high-flow (200 cell) catalytic converters

Features and Components

• Equal-Length Mid-Section: Balances pulses for a cleaner, smoother tone without losing aggression
• H-Pipe Design: Improves scavenging for a fuller, more refined sound
• Dual-Mode Operation: Raw and loud (open) or subdued and civilized (closed)

Fits

• 2014-2020 BMW M3, M4