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I would stay away from FI, As stated above the base compression ratio is fairly high to TC or SC. To do it properly and to stay in the desired AF it would be advisable to go with stand alone, tons of dyno runs, accurate pyrometer, wide band, drop the compression and at that cost point stick with a 3.4.
If you really want the performance of of your old WRX you can always drop that motor in.
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