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Valvetronic Valved Sport Catback Exhaust System - BMW M3 / M4 (G8x) 2021-2025
Lease for as low as $/week
BMW G80 M3 / G82–G83 M4 Exhaust System
Single 3.5" Equal-Length Mid-Pipe + Optional Valved Axle-Back (T304 Stainless or Grade 5 Titanium)
Overview
The G80/G82/G83 is a phenomenal M car—its soundtrack just needs to catch up. Our single 3.5" equal-length mid-pipe unlocks the character the S58 deserves without requiring changes to the OEM rear section. Add the Valvetronic Designs valved axle-back for even more presence and control.
Compatible with OEM downpipes or free-flow front pipes, this system is engineered to deliver a higher-pitch, refined note with zero check-engine lights.
Sound With Free Flow Downpipes:
Sound With Stock Downpipes:
Why It Works
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Equal-length design: Balances exhaust pulses for a smoother, higher-frequency tone.
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Single 3.5" mid-section: Optimized flow for improved response and power throughout the rev range.
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Modular by design: Pairs with OEM or aftermarket rear sections; upgrade path to our valved axle-back at any time.
Sound & Control
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With stock downpipes: Noticeably crisper, more engaging tone without drone.
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With our valved axle-back (optional): Quad-chamber muffler and OEM-style valves deliver daily-driver civility closed, and an aggressive, motorsport edge opened—at the touch of a button.
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No CEL: System is designed to avoid check-engine lights.
Construction & Options
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Materials: T304 stainless steel or ultra-light Grade 5 titanium.
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Weight savings: Up to –57.8 lb (Titanium) or –24.7 lb (Stainless) vs. factory.
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Craftsmanship: Precision TIG welds, fully mandrel-bent tubing, and included cross brace for rigidity.
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Tips: Premium double-wall or single wall tips included.
Valve Integration
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Electronic valve control with included controller for rapid open/close.
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OEM integration available if you prefer factory valve control behavior.
Fitment
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2020+ BMW G80 M3
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2020+ BMW G82 M4 (Coupe)
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2020+ BMW G83 M4 (Convertible)
Installation Notes
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Mid-pipe and axle-back can be installed independently.
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When installing only a mid-pipe or axle-back, make the rear-section cut at the second dimple on the OEM pipe to ensure proper fitment.
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100% reversible—return to stock at any time.
Compatibility Notice (V3 Systems)
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V1/V2 components are not compatible with V3.
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The V3 mid-pipe includes additional clearances at the downpipe connection and mid-section; small visible gaps prior to tightening are normal and by design.
What’s Included
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Single 3.5" equal-length mid-pipe assembly
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Cross brace
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Optional: Valved axle-back with controller and tips
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Hardware and clamps
Specifications
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Tubing diameter: 3.5" mid-pipe; 2.75" axle-back
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Materials: T304 stainless steel or Grade 5 titanium
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Finish: Brushed (Stainless) or raw/brushed (Titanium)
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Valves: Electronic, with remote controller (OEM integration available)
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.