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Whether you're building a street car or a track weapon, this is a proven starting point for your Cavalier or Sunfire.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eSBR Performance-supplied ECU\/ECM, custom tuned for the 2003-2005 Ecotec manual transmission combination. Plug-and-play installation — no additional programming tools or dealer visits required.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eBefore You Order\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003ePlease list any engine modifications in the order comments at checkout — camshaft, head work, intake, forced induction, injectors, etc. The more we know about your build, the better we can calibrate for it. All orders are handled with complete confidentiality.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eQuestions about camshaft options, fitment, or what tune is right for your build? 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