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Description
BMW F8x M3 / M4 Equal Length Valved Sport Exhaust SystemBMW F8X M3 M4 Valved Cat Back Exhaust System Equal Length 2. 75" Mid Section with H Pipe and 3. 5" Axle Back (T304 Stainless Steel or Grade 5 Titanium) Overview 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 solutioneliminating the factory harshness and
BMW F8X M3/M4 Valved Cat-Back Exhaust System
Equal-Length 2.75" Mid-Section with H-Pipe and 3.5" Axle-Back
(T304 Stainless Steel or Grade 5 Titanium)
Overview
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.
Why It Works
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Equal-Length Mid-Section: Balances pulses for a cleaner, smoother tone without losing aggression.
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H-Pipe Design: Improves scavenging for a fuller, more refined sound.
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Dual-Mode Operation: Raw and loud (open) or subdued and civilized (closed).
Sound & Control
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Valves Open: Aggressive, free-breathing tone with reduced rasp and improved high-rpm clarity.
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Valves Closed: Stock-like sound levels for stealthy driving.
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Electronic Valve Control: Includes standalone controller; OEM integration available.
Construction & Options
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Materials: T304 stainless steel or Grade 5 titanium.
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Weight Savings: –21.7 lb (Stainless) / –49.2 lb (Titanium) vs. OEM.
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Craftsmanship: Precision TIG welds and fully mandrel-bent tubing for maximum flow.
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Tips: Multiple premium finish options to complement your M3 or M4.
Fitment
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2015–2018 BMW M3 (F80)
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2015–2020 BMW M4 Coupe (F82)
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2015–2020 BMW M4 Convertible (F83)
Installation Notes
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Direct bolt-on; no cutting or welding required.
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100% reversible—return to stock at any time.
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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.
What’s Included
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2.75" equal-length H-pipe mid-section
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3.5" axle-back with quad-chamber muffler
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Electronic valve system with controller (OEM integration optional)
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All necessary clamps and hardware
Specifications
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Mid-Section Diameter: 2.75" equal-length with H-pipe
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Axle-Back Diameter: 3.5"
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Material: T304 stainless steel or Grade 5 titanium
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Valves: Electronic, rapid open/close
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Weight Savings: –21.7 lb (Stainless) / –49.2 lb (Titanium) vs. OEM
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Design: Quad-chamber muffler for refined closed-valve tone
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy