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same compressor, but with a 53/48mm turbine. The F is internally gated and the RR is for an external gate. The 1820F is sold as a bolt-on kit for the WRX, and has made over 350 rwhp in that application. Keep in mind, this is a single turbo, and 20-25% loss from the AWD. No idea on the 1820RR, but PE rates it at 500 ps EACH.
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