it dropped the horses as the ecu was pulling the timing at the top end, due to the 3 inch exhaust fitting allowing it to breath more freely thus running slightly lean. simples.
when remapped Duncan has played it on the safe side and given you the BHP you now have, but BHP isn't really worth worrying about, it is torque and reliability you want. though you also don't want too much torque as the 5 speed will poop itself.
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2002 Bugeye WRX Wagon - deceased
1995 555 STi v2 track build
1999 RB5
2003 Blobeye WRX SL Wagon
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