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4.6L / 5.4L 2V PI - NPI Turbo Camshafts
Stage 1 and Stage 2 Turbo cams will work with the stock valve springs up to about 8lbs of boost. Above that aftermarket springs are required. Our Stage 2 Turbo cam has made 700RWHP on the stock plastic intake with a single 70mm turbo and 22lbs of boost. This is one place to be more conservative than normal when it comes to cam sizing.
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