VF39 is twin scroll.
You need headers, exhaust down pipe, oil lines, brackets. The air/fuel ratio sensor is in a different spot.
You will definitely need a tune as well.
Upgrade injectors and fuel pump to be safe

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