This Airtec 2.5” Big Boost Pipes kit is an essential upgrade for the Ford Focus ST and RS MK2, particularly when using remaps and achieving higher power outputs.
The kit replaces the restrictive 2.0” OEM pipes with larger 2.5” pipes, ensuring better airflow, increased power and faster turbo response. Thanks to its design with fewer joints, airflow is optimised for maximum efficiency.
Benefits
• Larger 2.5” pipes for improved
airflow• +11.8 bhp and +9 lb/ft gain (bolt-on)
• Faster turbo
response• Less restriction than OEM•
Ideal for high-performance builds (375+ bhp)
• Reliable at high boost pressures
Technical specifications
• hot side: 2.5” aluminium (turbo → Intercooler)
• cold side: 2.5” silicone hose (Intercooler → throttle body)
• 5-layer 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 information
• The ST225 must have 2.5” Intercooler outlets (OEM is 2”)
• Does NOT fit Stage 1/2
intercoolers• DOES fit Stage 3 intercoolers
Contents
• Complete boost pipe kit•
Aluminium
pipes• Silicone
hoses• Fitting parts
Important information
• direct replacement (no modifications required)
• Fitting time: approx. 1
hour• Ideal for vehicles with increased power
Frequently asked questions
What are the benefits of this upgrade?
Increased power, improved airflow and more stable performance at high boost.
Is this suitable for a standard car?
Yes, but it really comes into its own with tuned set-ups.
Why use larger boost pipes?
Less restriction = more air = more power.
