The ALTA Blow Off Valve Spring Upgrade is a simple, cost-effective performance enhancement for your factory BOV. Designed specifically for MINI Turbo models, including Cooper S and JCW variants, this drop-in spring increases boost retention between shifts, reduces turbo lag, and improves overall responsiveness—all without replacing the entire valve assembly.

Constructed from heat-treated 17-7 stainless steel and rated for over 7 million cycles, this spring upgrade holds and vents boost pressure effectively, tested up to 40 PSI. It delivers reliable performance under demanding conditions while preserving the electromechanical function of your OEM blow-off valve.

Key Features:

• Optimized Spring Rate – Holds more boost between shifts without compromising valve operation

• Heat-Treated 17-7 Stainless Steel – High strength, long-lasting material rated for 7M+ cycles

• Improves Turbo Response – Reduces turbo lag and maintains boost pressure more efficiently

• Cost-Effective Upgrade – A fraction of the price of full BOV replacements

• DIY-Friendly – Installs in under 30 minutes with basic tools

• Tested to Withstand 40 PSI – Ensures durability even under high-performance conditions

• Backed by ALTA's 5-Year Warranty

Vehicle Fitment:

• 2007–2013 MINI Cooper S (R56)

• 2009–2013 MINI Cooper JCW

• 2008–2013 MINI Clubman S

• 2008–2013 MINI Cooper Convertible S

What’s Included:

• (1) ALTA Blow Off Valve Spring

• Step-by-Step Installation Instructions

• ALTA Performance Decal