This Airtec 2.5” Big Boost Pipes kit is an essential upgrade for Ford Focus ST and RS MK2, especially during remaps and at higher power levels.
The kit replaces the restrictive 2.0” OEM pipes with larger 2.5” tubes, which ensures better airflow, more power and faster turbo responseThanks to the design with fewer connections, the airflow is optimized for maximum efficiency.
Advantages
• Larger 2.5” ducts for better airflow
• +11.8 bhp and +9 lb/ft gain (bolt-on)
• Faster turbo response
• Fewer restrictions than OEM
• Ideal for high-performance builds (375+ bhp)
• Reliable at high boost pressure
Technical specifications
• Hot side: 2.5” aluminum (turbo → intercooler)
• Cold side: 2.5” silicone hose (intercooler → throttle body)
• 5-ply silicone couplings
• Option: with or without dump valve connection
• Swaged pipe ends to prevent coming loose
Compatibility
• Ford Focus ST MK2 (ST225)
• Ford Focus RS MK2
Compatible with intercoolers
• Airtec
• Pace
• Pro Alloy
• Forge
• OEM Ford
Important compatibility info
• ST225 must have 2.5” intercooler outlets (OEM is 2”)
• Does NOT fit Stage 1/2 intercoolers
• DOES fit on Stage 3 intercoolers
Contents
• Complete boost pipe kit
• Aluminium pipes
• Silicone hoses
• Assembly parts
Important information
• Direct replacement (no modifications needed)
• Assembly time: ±1 hour
• Ideal for vehicles with increased power
Frequently Asked Questions
What does this upgrade bring?
More power, better airflow, and more stable performance at high boost.
Is this suitable for a standard car?
Yes, but it comes into its own best with tuned setups.
Why larger boost pipes?
Less restriction = more air = more power.
