That's a good question. If I'm not mistaken, the heads are quite a bit different (on the inside), but I'm not sure. The '99 GTs are really stout bone-stock. I'm not sure you'd see much if you haven't done any exhaust work, pulleys, etc. If I see anything in my back issues of MMFF, I'll make a post to that effect, and/or email you.
-- Greg
------------------
'96 Cobra - K&N, Pro-M 77, Pro 5.0 shifter, 3:73s, Cobra "R"s, Steeda control arms, pulleys, springs and caster/camber plates.
|