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Valvetronic Equal Length Valved Sport Catback Exhaust System - BMW M3 / M4 (F8x) 2015-2020
Lease for as low as $/week
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
Returns may be accepted within 14 days of purchase pending Return Merchandise Authorization (RMA). No returns or cancellations on special order items. All returns will be charged a 20% restocking fee, no exceptions.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. Item must be able to be resold as new.
Several types of goods are exempt from being returned. Hazardous materials, fluids, greases, chemicals, and clothing are not able to return.
Free shipping is available within the lower 48 states for most orders totaling $199 or more. A free shipping option will be available during checkout. This offer is for delivery address in the continental United States and excludes shipments going to Alaska, Hawaii, Military Boxes, and items that require freight shipping.
Processing Time
Patterson Performance stocks a large quantity of items at any given time. Some items may require drop shipping from one of our various distributors. In stock items will ship within 1-2 business days. If you're needing your product quickly, please contact us to verify product availability before placing your order. Orders requiring additional verification (security concerns, incorrect information, etc.) may need additional processing time. Estimated shipping dates are not guaranteed and are subject to change based on inventory levels and manufacturer lead times. Backordered items are shipped immediately once available.
Items ship daily, If the item you ordered is not in stock, a member of our team will contact you via email / phone.
Patterson Performance will only ship to an address that varies from your billing address if payment is made via Paypal or a financing partner.
Patterson Performance ships from multiple warehouses throughout the United States, and sometimes from manufacturers overseas.
You can simply contact us via email / telephone for a live inventory check
Find more information at www.P65Warnings.ca.gov.