MAP beehive valve springs are engineered to exacting tolerances utilizing only the finest materials by an ISO certified valve spring manufacturer.
This particular kit includes a complete set of 16 valve springs only as they were designed to utilize the factory Evolution 8 & 9 spring seats and retainers.
Important Note: These springs will work ONLY with the stock Evo 8/9 retainers or MAP Titanium Retainers. Other stock 4G63 retainers (including Evo 7) are NOT compatible with these springs.
If valvetrain stability is your primary concern, replacing your factory springs with these alone is more than sufficient for the majority of our customers.