i just installed the 99 heads on my 96 stang this last week end.. i can say that you get alot more than 45hp. the power band is awesome. on my 96 power really died at 5k rpm. it pulls hard to redline know! i did port them myself to save money and did all the labor. the hardest part of the whole job was the dipstick tube. bastard just didnt want to go back in. the good or bad thing depending on your point of view is the head swap raises comression to just over 10 to 1. the 99 motor is 9 to 1. 1st and 2nd gear smokes the tires now!!!
the 2001 heads is the cheaper way. i bought my stuff last year. the svo stuff is good but to much, plus you dont get the better cams. good luck.
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96 stang, 373's, 70mm t/b, gutted maf, bassani x-pipe w/cats, ultraflow catback, home depot ram air, k@n. 14.75 @ 95mph.
[This message has been edited by 46stang (edited 02-06-2001).]