High performance cams for a near stock 2JZ-GTE engine. Great for street cars. Good throttle response. Improved low to mid-range power and fast spool. Suits stock twin turbos or single 54mm-58mm turbo upgrade. Can use OEM valve spring up to stock boost and rpm limit. For up to 7500rpm and 30psi boost Kelford Cams recommend valve spring KVS02.