Toyota 1JZ-GTE VVTi Camshaft. Great for street cars. Ultimate throttle response with VVT-i. Improved low to mid-range power and fast spool. Suits stock turbo or 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 KVS109-1JZ.