RM-Z450 ’05-’14 CV4 Hi Performance Lightweight Racing Valve Spring Kit Purpose built racing valve spring made from the highest quality Kobe spring wire Single spring, low drag design increases horsepower Designed for use with most cam grinds Sold as pairs unless noted Springs can only be used on titanium valves Price: $69.95 Quantity: Intake Springs ONLY (EC-CV-PSIMX2602) Exhaust Springs ONLY (EC-CV-PSIMX2404)