The KVS87-DT spring kit is for Turbo Charged Subaru and Toyota models with FA20 engines. It features a Dual Spring and Titanium Retainer Kit that has 88lb seated pressure @ 32.85mm using the OEM seat, 228lb @ 11mm lift, 262lb @ 12mm lift. Coil Bind is at 18.55mm.
 
The FA20 has proven to be a wonderful platform with a turbocharger strapped on. Whether it is the VA chassis WRX or the BRZ/FRS/GT86 platform, the FA20 provides excellent bottom-end torque with plenty of power left to give higher into the RPMs when turbocharged.
 
Common issue owners are running into is valve float at higher RPMs.
 
Valve float is a result of the valve springs not being able to compress and rebound fast enough with the rate of the camshafts. Kelford developed a set of dual valve springs that feature titanium retainers. Utilizing the factory valve spring seats, the Kelford spring kit simply replaces the factory single spring with a beefy dual spring.

Features:
Dual Spring and Titanium Retainer Kit
88lb seated pressure @ 32.85mm using the OEM seat
228lb @ 11mm lift
262lb @ 12mm lift
Coil Bind is at 18.55mm.
Fitment:
Make and Models with FA20 engines:
Subaru WRX Turbo 2015-2020
Subaru BRZ 2013-2020
Toyota GT86 2012-2017