The HP figures are actually the same for the Dinan stage II on the 35i and 35is according to their website....except that the oil cooler isnt required as all 35is cars come with one and some 35i cars did not earlier on.
http://www.dinancars.com/shop/index....ive35is#page=1
What im interested in now is the new COBB tuning flash at home software for a fraction of the price Dinan want!!