SAE or actual numbers? Also, did you reset your ECU prior to the dyno? Also, you should probably dyno in 4th. Was this a dyno jet or mustang dyno?
Could be any number of things honestly...if the room was hot your car will pull timing and that will KILL your numbers. Of course, did you make sure that the stability control was turned off? Better yet...disabled completely? Last question...what fuel were you running?
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Chris 
Current: 2014 WRX Stage I + SPT / 2013 Hayabusa 202HP
Former:09 370Z 7-AT PW/Ark Type 2 exhaust/Evo R lip/TSW Nurburgring carbon
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