The Kelford Cams KVS109-3S valve spring upgrade is recommended for 3S-GTE engines running 262° cams and producing around 400hp. These cams work well for those who drive their car daily and want good drivability. With an OEM or upgraded turbo sizing between 48-54mm, there is a significant increase in mid-range power, particularly when used on turbo applications.
This increase in power is especially noticeable for E85 applications.