The ultimate turbo Stage 1 performance cams for Mazda B6 engines found in the MX-5 Miata. Suits OEM turbo on B6T engines, or turbo upgrade 44-54mm. Maintains great street drivability and mild idle. Good improvement in mid-range power compared to OEM cams. Great upgrade for cars used for spirited driving and track days. Kelford Cams recommend KVS12 valve spring upgrade.