I completely agree with David. The HP units are great if you dont need some of the advanced features of the Dominator and at a considerably reduced price. As for the factory crate motors with electronics that is also a possibility provided you dont want to start messing with things. If you require tuning they are considerably more of a pain than a standalone unit, especially the ford ones. Sometimes the factory tune is not fantastic either. If you go this route make sure to get some reviews first and also be sure to follow ALL instructions regarding intake pipework with MAF fitted engines.
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