272° camshaft designed to work with OEM valve springs. Rough idle note with exhaust upgrade. Increase in mid-high rpm power with upgraded turbo. Upgraded turbo size range 48-58mm compressor inducer. Broader power band and improved throttle response when using MIVEC. For high mileage engines Kelford Cams recommend valve spring KVS63-BK which uses the OEM retainer.
