If your running a Fmic then it's advisable to remap them as you have changed the air flow and I'd imagine a cone/pod filter of some sort to allow fitment of the I/C pipe,
If your going to map it the 380 injectors you have will be fully maxed out at the power your looking for, you can fit the later yellow 440s which will happily run 320.
Run grade 7 plugs.
310/320 is really the max you will want to run a stock v2 wrx engine and box .
The gear ratio in them and 1190kg car does make it a fast little motor.
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