You probably would have to let dpi know, because your changing the engine. But because it's a smaller capacity, it shouldn't be an issue. when I did an RS conversion on my old Liberty, I didn't tell them, had no issues. Telling your insurance company is more important.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i