231rwhp SAE was with a catback so you minus 7rwhp for the catback and that puts him in the low 220's rwhp. i am guessing the catback would atleast be worth 7rwhp.
so everything seems right to me. gratz on numbers.
200-210rwhp you were expecting might have been closer with a 5.0 motor from the fox's but most 99-04 gt's are in the 220's rwhp stock.
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