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To review, the 2V engines got a makeover in 1999 when Ford, responding to customers' pleas for more power, redesigned the cylinder heads. These Power Improvement (PI) heads had smaller combustion chambers combined with bigger intake runners. Matching the heads was a new, better-flowing intake manifold. The increase in flow and more efficient combustion was worth more than 30 additional horsepower over the non-PI (NPI) design.