These are high-performance drag racing cams designed for turbocharged 2GR engines. They have a 280°/286° profile and are capable of producing 1200-1600hp. They work best in single 76mm+ or twin turbo setups ranging from 58-68mm. They also work great with 4.0L stroker builds and are compatible with E85 or methanol. For engines operating at high RPMs and extreme boost levels, it is recommended to upgrade the valve spring and retainer to KVS263. It's possible to maintain the use of VVT-i, but it's important to check valve-to-piston clearance carefully. If not, fixed cam timing should be used instead.