Description
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 Black Single Wall Tips
What’s Included
- Equal-length H-pipe mid-section
- Axle-back with quad-chamber muffler
- Electronic valve system with controller (OEM integration optional)
- Black Valvetronic 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
Specification
- Color: Black
- Exhaust Type: Catback
- Finish: Anodized
- Material: T304 Stainless Steel
- Liter: 3.0 Liter
- Exhaust Tip Outlet Size: 3.5 Inch
- Mount Style: Bolt On
