The AMS Performance BMW G8X M2/M3/M4 S58 Open Airbox Intake System is engineered to deliver maximum airflow, power, and throttle response for the twin-turbocharged S58 engine. Designed with a massive 3.5" carbon fiber intake tube and smooth-transition 4-ply silicone couplers, this system ensures unrestricted, laminar airflow into the turbos for superior performance. Oversized cast aluminum turbo inlet elbows—up to 128% larger than stock—provide a direct and unobstructed path to the compressor wheels for drastically improved efficiency.

This open airbox configuration enhances induction sound and airflow while maintaining exceptional reliability with dry filter media that is easy to clean and maintain. Dyno testing has demonstrated peak gains of +86 WHP over stock and an average gain of +66 WHP above 5000 RPM, delivering a broader, more consistent powerband all the way to redline. The precision-engineered components ensure a perfect fit and straightforward installation, backed by AMS Performance’s industry-leading documentation.

Every aspect of this system is the result of extensive engineering, flowbench validation, and real-world testing. From minimized pressure drop across the intake tract to perfectly matched airflow across both banks, this intake delivers repeatable and measurable gains—whether on the street, track, or dyno. The open-top configuration provides maximum airflow and an aggressive sound profile, making it the ideal choice for drivers seeking peak performance and a bold engine presence.

Professional racers and calibrators have validated the intake’s performance, reporting improved turbo response, stronger top-end power, and noticeably enhanced drivability. Track testing confirms reduced restriction, consistent airflow at high RPM, and improved lap-to-lap performance thanks to stronger sustained power delivery.

Key Features

• +86 WHP maximum gains over stock during testing

• Average of +66 WHP gained above 5000 RPM

• Open airbox design for maximum airflow and induction sound

• 3.5" carbon intake tube for improved airflow vs. OEM

• Up to 128% larger turbo inlet cross section vs. OEM

• Up to a 48% reduction in intake restriction compared to stock

• Massive cast turbo inlet elbows for direct, unobstructed airflow

• Dry filter media for long-term reliability and easy cleaning

• High-quality 4-ply hump hose silicone for smooth air delivery

• Precision fitment with easy installation and detailed instructions

• Independently validated results from professional calibrators and racers

Engineering Advantages
AMS Snailworks Engineering designed the S58 intake system to maximize airflow and minimize restriction throughout the intake path. Advanced CFD modeling and flowbench testing created a smooth and efficient air passage that supports improved compressor efficiency, reduced pressure drop, and stronger power delivery across the entire RPM range.

The intake design incorporates a radiused filter edge to reduce entry losses and optimized silicone couplers for seamless transitions. The result is improved turbo response, reduced turbulence, and increased airflow consistency across both banks—critical for predictable tuning and balanced performance.

Flowbench-Validated Performance
Comparative testing against OEM and leading competitor intakes showed the AMS system delivered significantly higher airflow at identical pressure drops. The OEM system exhibited as much as –2.15 psi of depression, while the AMS intake reduced this to only –1.05 psi—representing up to a 48% reduction in restriction. The G8X S58 intakes maintained nearly identical airflow between banks, confirming precise design and matched system efficiency.

Track Tested, Race Proven
During professional track testing, the AMS G8X intake system allowed sustained top-end power to redline, improving straight-line speed, shift points, and corner exit acceleration. Real-world performance gains translated into measurable lap-time improvements thanks to stronger, more consistent high-RPM power delivery.

Product Notes
The dry filters can be cleaned with compressed air from the inside out (30–40 psi). For deep cleaning, use a mild biodegradable cleaner, rinse thoroughly, and allow sufficient drying time. Carbon fiber components are hand-laid, and slight weave variances or cosmetic imperfections may occur.

Vehicle Fitment

• 2023+ BMW M2 with 3.0L S58 Turbocharged Engine (G87; all sub-models)

• 2021+ BMW M3 with 3.0L S58 Turbocharged Engine (G80 & G81; all sub-models)

• 2021+ BMW M4 with 3.0L S58 Turbocharged Engine (G82 & G83; all sub-models)

This intake system is the ultimate upgrade for drivers seeking proven horsepower gains, enhanced turbo response, and unmatched airflow performance for their BMW G8X platform.