[sorrowfulkiller]

don't bother with a map sensor... setup a blowthru maf setup with the maf between the turbo and the tb and a bov before the maf and rescale the maf



I have an 02 wrx nowadays and this is my next project after a front mount intercooler.

basically the easy way to do a rescale if its not in the hardware is to multiply every value correlating to air to fuel ratio and timing tables by 1/2 to say gain twice the amount of rescale area
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or instance if you could only shove 250 cfm of air into your engine before the rescale you could now shove 500 cfm into the engine and only have to do slight retuning since you will also be narrowing the available voltage scale for a particular load. So you will have to do a bit more fine tunning for it to work properly.