260° street performance cams for 1JZ GTE VVTi Engines. Improved low to mid-range power and fast spool. Ultimate throttle response with VVT-i. Suits upgraded turbo 54-64mm. 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.