BMW F32/F33/F36 Valved Cat-Back Quad-Tip Exhaust System – Coupe, Convertible & Gran Coupe (B48 Engine, RWD / xDrive) | Select Quiet or Loud Sound, Premium Performance Upgrade

Unlock the true personality of your B48-powered 4 Series with the BAVMODS® Quad-Tip Valved Cat-Back Exhaust System, engineered for the BMW F32/F33/F36 Coupe, Convertible and Gran Coupe. This system delivers a perfect balance of everyday refinement and weekend aggression — complete with a bold quad-exit layout that instantly elevates your car’s rear profile.

Whether you’re after deeper tone, improved throttle response, or a sportier stance, this cat-back brings all three together in a precision-built, OEM+ package.

Dual-Mode Valve Control: Quiet or Loud on Demand

Take control of your exhaust note with a valve-actuated system that lets you switch between two distinct sound modes:

• Quiet Mode (Valves Closed): A refined, subtle tone ideal for daily driving or early-morning starts.

• Loud Mode (Valves Open): A sharp, aggressive sound with pronounced turbo spool, deep growl, and exhilarating overrun burbles.

With the push of a button, your F32/F33/F36 transforms from composed cruiser to head-turning performer — all while maintaining OEM-level fitment and drivability.

Designed for Performance Flow & Aesthetic Impact

This system enhances both flow efficiency and visual appeal. The redesigned exhaust path reduces restriction for improved exhaust velocity and throttle response, while the quad-tip rear section gives your 4 Series the sporty look it deserves.

Each tip is positioned for a symmetrical, performance-inspired finish — perfectly aligning with M-style or aftermarket diffusers for an aggressive, track-ready appearance.

The internal muffler layout balances tone and backpressure, ensuring strong midrange torque and smooth acceleration across the RPM band.

Key Features & Benefits

• Quad-Tip Layout – Instantly transforms your rear-end design with an aggressive, performance-driven appearance.
• Dual-Mode Valve Control – Switch between quiet cruising and open-valve aggression at any moment.
• Enhanced Flow Dynamics – Freer exhaust flow for sharper throttle response and improved performance potential.
• Aggressive Yet Controlled Tone – Deep, resonant sound when opened, refined and subtle when closed.
• Plug-and-Play Installation – Direct bolt-on fitment using factory hangers and mounts.
• OEM+ Design Language – Seamless integration with stock or M-style rear diffusers.

Included Components

• Complete valved cat-back exhaust system (mid-pipe + rear section)
• Quad exhaust tips – available in polished, chrome, or black finishes depending on variant
• Valve control module or remote toggle system
• Mounting hardware, clamps, and gaskets

Performance & Sound You Can Feel

The BAVMODS® Quad-Tip Valved Cat-Back Exhaust System brings out the best of the N20’s turbocharged character.

With valves closed, it hums with a smooth, OEM-like tone. Open them up, and your 3 Series comes alive — delivering a deep, commanding sound that perfectly complements the bold quad-exit look.

Expect:

• Deeper, more refined tone under load
• Improved exhaust flow for enhanced response
• Aggressive rear-end presence with quad tips
• Balanced sound control for daily comfort or spirited driving

This is more than just an exhaust — it’s a statement of performance and precision, built for those who demand both form and function.

FITMENT: BMW 4 Series – F32 / F33 / F36 (2014–2020) including F32 Coupe: 420i, 428i, 430i (B48 engine), F33 Convertible: 420i, 428i, 430i (B48 engine), F36 Gran Coupe: 420i, 428i, 430i (B48 engine).

• Compatible with RWD and xDrive configurations

Note: Designed specifically for B48-equipped models. Not compatible with 435i, 440i, or N2X/N55 engine variants.

Please refer to the “Fitment” section in the product description for compatibility details.