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Forge Motorsport Catch Tank for Audi S4/S5 B9

SKU: FMCT4

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£368.63
Tax included

Protect your Audi S4/S5 B9 from performance-robbing carbon buildup. The Forge FMCT4 Catch Tank Kit removes harmful oil mist from the intake system for peak engine longevity.

Or pay 12 installments of £30.72 with humm. Available at checkout. UK & IE residents 18+. Subject to status.
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The Audi S4 and S5 (B9) 3.0 TFSI engines are masterpieces of engineering, but they share a common vulnerability with many direct-injection powerplants: carbon buildup on the intake valves. The Forge Motorsport FMCT4 Catch Tank Kit is a high-performance solution designed to intercept and collect oil mist and moisture from the PCV system. By preventing these contaminants from entering the intake tract, this kit ensures your valves stay cleaner for longer, preserving horsepower and throttle response while preventing potential long-term engine damage.

Forge FMCT4 Catch Tank Kit for Audi S4 S5 B9

Key Performance Features

  • Engine Protection: Significantly reduces carbon accumulation on intake valves to maintain engine efficiency.
  • CNC Machined Components: Features high-quality billet aluminium fittings and a precision-manufactured tank for a leak-free seal.
  • Internal Baffling: The tank includes an advanced internal baffle system to effectively separate oil and water from the air stream.
  • Integrated Dipstick: Allows for quick and easy checking of the collected levels without needing to remove the tank.
  • Bespoke Mounting: Includes a chassis-specific laser-cut bracket for a secure, professional installation that looks OEM.

Choose Your Option

To ensure this kit complements your engine bay perfectly, Forge Motorsport provides high-quality reinforced silicone hoses. These hoses are designed to withstand extreme temperatures and engine fluids. While the standard kit is often supplied in black for a stealthy look, there are several hose colour options available including Black, Blue, and Red. Please specify your preference to ensure your engine bay looks as good as it performs.

FMCT4 Fitted View Audi B9

Compatibility & Applications

This kit is specifically engineered for the 3.0 TFSI engine found in the B9 chassis Audi S4 and S5 models.

Manufacturer Model & Year
Audi S4 (B9) 2017 - Onwards
Audi S5 (B9) 2017 - Onwards

Installation Note: This kit replaces the original PCV hose. It is designed for simple maintenance with a drain plug located at the base of the tank. For technical support, contact MGM Leeds Support Team.


Download the Installation Instructions

Book Installation at MGM Leeds

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