MST Performance Audi A4 (B9) 2.0 Quattro Air Intake Kit (No MAF)

MST Performance Audi A4 (B9) 2.0 Quattro Air Intake Kit – MST-AD-A405

This intake kit from MST Performance is a straightforward upgrade for the Audi A4 (B9) 2.0 Quattro, replacing the factory airbox with a freer-flowing setup that lets the turbocharger breathe more easily. The result is improved throttle response, a more direct power delivery, and a noticeable induction sound under acceleration.

The standard airbox fitted to these cars is designed with noise reduction and cost in mind, not outright performance. By replacing it with a less restrictive intake system, you allow a greater volume of cooler air to reach the turbocharger – and a well-fed turbo is a more effective one. This kit is suitable whether the car is completely standard or has already had some tuning work carried out.

What’s Included

• Black powder-coated heat shield – helps keep intake air cool and away from engine heat
• Black silicone inlet pipe – flexible, durable, and a direct replacement for the factory pipe
• Red dry pleated performance filter – easy to clean and maintain, no oiling required
• Full fitting hardware and step-by-step instructions

Performance and Benefits

MST quote dyno-tested gains of up to 12-14bhp on this application. As with any intake upgrade, real-world results can vary depending on the condition of the vehicle, its current state of tune, and other factors – but these figures are based on back-to-back testing and are a realistic guide to what this kit can deliver.

Throttle response – how quickly the engine reacts when you press the accelerator – tends to feel noticeably sharper with this kit fitted, which makes the car feel more responsive even before any power gains are considered. The induction noise, that characteristic intake growl under load, also becomes more audible, which many drivers find adds to the driving experience.

Please note: this kit is specified as “No MAF”, meaning it does not include or require a Mass Air Flow sensor (a sensor that measures the volume of air entering the engine). Confirm this matches your vehicle’s existing setup before purchasing.

Build Quality

MST Performance build their kits using quality components throughout. The powder-coated heat shield is sturdy and resistant to the underbonnet environment, while the silicone inlet pipe is designed for a reliable, airtight fit. The dry pleated filter can be cleaned and reused, making it a cost-effective long-term replacement for disposable paper filters.

Installation is straightforward and can typically be completed at home with basic tools, thanks to the included instructions.

This kit is designed for the Audi A4 (B9) 2.0 Quattro. Please use the vehicle lookup tool on this page or check the Vehicle Fitment tab to confirm compatibility with your specific model and engine variant before ordering.