HP10T9-HP109-HPSS-KIT High Performance Porsche 9mm Valve Springs and Ti-retainer kit part-106437-12-PKG *Fits multiple 228mm flywheels

*Fits multiple 228mm flywheels

Aasco Billet Steel Midweight Flywheel For Porsche 911 996/997 Flywheel

14lb Aluminum Flywheel

(910 LB-FT) INCLUDES HRB KIT

making it the perfect choice for any performance driving needs

HP10T9-HP109-HPSS-KIT High Performance Porsche 9mm Valve Springs and Ti-retainer kit part-106437-12-PKG *Fits multiple 228mm flywheels9mm Kit includes Aasco HP109 High Performance Valve springs, HP10T9 Titanium spring retainers and HPSS Spring Seats. Our Valve Springs are designed and manufactured to specifically fit the envelope of a Porsche application not a spring from another use. It operates a higher natural frequency than the original spring for racing and at the very least minimizes damage from over rev in track day situations. 911, 914, 930, 935